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Case op12 ·
evaluated model Qwen359B ·
judges ClaudeAI, GeminiAI, OpenAI
Selection reason: disagreement_census
Understanding point
data unpacking
Code snippet · op12/code1.txt
// positive sp value has been detected, the output may be wrong!
void __usercall start(int a1@<eax>, int a2@<edx>, int a3@<ecx>)
{
int *v3; // esi
int *v4; // edi
unsigned int v5; // ebp
char v6; // al
bool v7; // cf
int v8; // ebx
int v9; // ebx
int v10; // ett
unsigned int v11; // eax
bool v12; // cf
int v13; // ebx
int v14; // ebx
int v15; // ett
bool v16; // zf
int v17; // ebx
int v18; // ett
unsigned int v19; // eax
unsigned int v20; // eax
int v21; // eax
bool v22; // cf
int v23; // ebx
int v24; // ebx
int v25; // ett
BOOL v26; // ecx
bool v27; // cf
int v28; // ebx
int v29; // ett
int v30; // ecx
int v31; // ecx
bool v32; // cf
int v33; // ebx
int v34; // ebx
int v35; // ett
bool v36; // zf
int v37; // ebx
int v38; // ett
unsigned int v39; // ecx
char *v40; // edx
char v41; // al
int v42; // eax
bool v43; // cc
int *v44; // esi
int *v45; // edi
int v46; // ecx
char v47; // al
unsigned __int8 v48; // al
int v49; // eax
int v50; // eax
char v51; // t0
unsigned __int8 v52; // bl
char *v53; // edi
int v54; // eax
int *v55; // ebx
int v56; // ebp
char v57; // al
char *v58; // ecx
unsigned __int8 v59; // al
int v60; // eax
void (__cdecl *v61)(int *, int, int, int *); // ebp
int *v62; // edi
int v63[4]; // [esp+1Ch] [ebp-90h] BYREF
int v64; // [esp+2Ch] [ebp-80h] BYREF
int v65; // [esp+30h] [ebp-7Ch] BYREF
char *v66; // [esp+34h] [ebp-78h]
int *v67; // [esp+38h] [ebp-74h]
int v68; // [esp+3Ch] [ebp-70h]
int v69; // [esp+40h] [ebp-6Ch]
int v70; // [esp+44h] [ebp-68h]
int v71; // [esp+48h] [ebp-64h]
int *v72; // [esp+4Ch] [ebp-60h]
int v73; // [esp+50h] [ebp-5Ch]
int v74; // [esp+54h] [ebp-58h]
int v75; // [esp+58h] [ebp-54h]
int v76; // [esp+5Ch] [ebp-50h] BYREF
v72 = &v76;
v70 = a3;
v69 = a2;
v68 = a1;
v3 = dword_425000;
v4 = &dword_425000[-36864];
TlsIndex[0] = 206634064;
v67 = &dword_425000[-36864];
v5 = -1;
while ( 1 )
{
v9 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v10 = v7 + v9;
v7 = __CFADD__(v7, v9) | __CFADD__(v9, v10);
v8 = v9 + v10;
do
{
if ( v7 )
{
v6 = *(_BYTE *)v3;
v3 = (int *)((char *)v3 + 1);
*(_BYTE *)v4 = v6;
v4 = (int *)((char *)v4 + 1);
}
else
{
v11 = 1;
while ( 1 )
{
v12 = __CFADD__(v8, v8);
v13 = 2 * v8;
if ( !v13 )
{
v14 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v15 = v7 + v14;
v12 = __CFADD__(v7, v14) | __CFADD__(v14, v15);
v13 = v14 + v15;
}
v11 += v12 + v11;
v7 = __CFADD__(v13, v13);
v16 = 2 * v13 == 0;
v8 = 2 * v13;
if ( v7 )
{
if ( !v16 )
break;
v17 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v18 = v7 + v17;
v7 = __CFADD__(v7, v17) | __CFADD__(v17, v18);
v8 = v17 + v18;
if ( v7 )
break;
}
}
v7 = v11 < 3;
v19 = v11 - 3;
if ( !v7 )
{
v20 = v19 << 8;
LOBYTE(v20) = *(_BYTE *)v3;
v3 = (int *)((char *)v3 + 1);
v21 = ~v20;
if ( !v21 )
{
v44 = v67;
v45 = v67;
v46 = 2658;
while ( 1 )
{
v47 = *(_BYTE *)v45;
v45 = (int *)((char *)v45 + 1);
v48 = v47 + 24;
while ( v48 <= 1u && *(_BYTE *)v45 == 6 )
{
v49 = *v45;
LOWORD(v49) = BYTE1(*v45);
v50 = __ROL4__(v49, 16);
v51 = v50;
LOBYTE(v50) = BYTE1(v50);
BYTE1(v50) = v51;
v52 = *((_BYTE *)v45 + 4) + 24;
*v45 = (int)v44 + v50 - (_DWORD)v45;
v45 = (int *)((char *)v45 + 5);
v48 = v52;
if ( !--v46 )
{
v53 = (char *)(v44 + 46080);
LABEL_38:
v54 = *(_DWORD *)v53;
if ( *(_DWORD *)v53 )
{
v55 = (int *)((char *)v44 + *((_DWORD *)v53 + 1));
v53 += 8;
v56 = ((int (__cdecl *)(int, int, int, int, int, int *, int, int, int))v44[48297])(
(int)v44 + v54 + 193048,
v68,
v69,
v70,
v71,
v72,
v73,
v74,
v75);
while ( 1 )
{
v57 = *v53++;
if ( !v57 )
goto LABEL_38;
v58 = v53;
v66 = v53;
v59 = v57 - 1;
do
{
if ( !v58 )
break;
v16 = *v53++ == (char)v59;
--v58;
}
while ( !v16 );
v60 = ((int (__cdecl *)(int, char *))v44[48298])(v56, v66);
if ( !v60 )
break;
*v55++ = v60;
}
v54 = ((int (*)(void))v44[48300])();
}
v61 = (void (__cdecl *)(int *, int, int, int *))v44[48299];
v62 = v44 - 1024;
v64 = v54;
v61(v44 - 1024, 4096, 4, &v64);
*((_BYTE *)v62 + 543) &= ~0x80u;
*((_BYTE *)v62 + 583) &= ~0x80u;
v61(v44 - 1024, 4096, v63[0], v63);
do
v64 = 0;
while ( &v64 != &v65 - 32 );
JUMPOUT(0x4248E8);
}
}
}
}
v5 = v21;
}
v22 = __CFADD__(v8, v8);
v23 = 2 * v8;
if ( !v23 )
{
v24 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v25 = v7 + v24;
v22 = __CFADD__(v7, v24) | __CFADD__(v24, v25);
v23 = v24 + v25;
}
v26 = v22;
v27 = __CFADD__(v23, v23);
v8 = 2 * v23;
if ( !v8 )
{
v28 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v29 = v7 + v28;
v27 = __CFADD__(v7, v28) | __CFADD__(v28, v29);
v8 = v28 + v29;
}
v30 = v26 + v27 + v26;
if ( !v30 )
{
v31 = 1;
while ( 1 )
{
v32 = __CFADD__(v8, v8);
v33 = 2 * v8;
if ( !v33 )
{
v34 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v35 = v7 + v34;
v32 = __CFADD__(v7, v34) | __CFADD__(v34, v35);
v33 = v34 + v35;
}
v31 += v32 + v31;
v7 = __CFADD__(v33, v33);
v36 = 2 * v33 == 0;
v8 = 2 * v33;
if ( v7 )
{
if ( !v36 )
break;
v37 = *v3;
v7 = (unsigned int)v3++ < 0xFFFFFFFC;
v38 = v7 + v37;
v7 = __CFADD__(v7, v37) | __CFADD__(v37, v38);
v8 = v37 + v38;
if ( v7 )
break;
}
}
v30 = v31 + 2;
}
v39 = (v5 < 0xFFFFF300) + v30 + 1;
v40 = (char *)v4 + v5;
if ( v5 <= 0xFFFFFFFC )
{
do
{
v42 = *(_DWORD *)v40;
v40 += 4;
*v4++ = v42;
v43 = v39 <= 4;
v39 -= 4;
}
while ( !v43 );
v4 = (int *)((char *)v4 + v39);
}
else
{
do
{
v41 = *v40++;
*(_BYTE *)v4 = v41;
v4 = (int *)((char *)v4 + 1);
--v39;
}
while ( v39 );
}
}
v7 = __CFADD__(v8, v8);
v8 *= 2;
}
while ( v8 );
}
}
Evaluated model output (what the LLM said about the code) · op12/result_Qwen359B1.txt
# Malware Static Analysis Report
## ⚠️ Disclaimer
This analysis is for **educational and defensive purposes only**. The code exhibits characteristics of malicious software. Do not execute or distribute this code.
---
## 1. Functionality Description
### Observed Facts (Directly from Code)
| Observation | Evidence |
|-------------|----------|
| Function signature | `void __usercall start(int a1@<eax>, int a2@<edx>, int a3@<ecx>)` |
| TLS manipulation | `TlsIndex[0] = 206634064;` |
| Function pointer array | `v44[48297]`, `v44[48298]`, `v44[48299]`, `v44[48300]` |
| Memory allocation | `v61(v44 - 1024, 4096, 4, &v64)` |
| Bit flag manipulation | `*((_BYTE *)v62 + 543) &= ~0x80u;` |
| Loop structure | Multiple nested `while` loops with complex conditions |
| Data reference | `dword_425000` with offset `[-36864]` |
### Inferred Behavior
1. **Process Injection**: The TLS index manipulation and function pointer array suggest this code may be performing process injection or DLL injection.
2. **Memory Allocation**: The call `v61(v44 - 1024, 4096, 4, &v64)` appears to allocate 4096 bytes of memory, which is typical for shellcode or payload storage.
3. **API Hooking**: The function pointer array at offsets 48297-48300 suggests API hooking or stubbing.
4. **Payload Execution**: The nested loops and conditional logic suggest payload execution or decryption.
---
## 2. Well-Known Algorithms
### Observed Patterns
| Pattern | Evidence |
|---------|----------|
| **Memory Copy** | `v6 = *(_BYTE *)v3; *(_BYTE *)v4 = v6;` |
| **Bitwise Operations** | `*((_BYTE *)v62 + 543) &= ~0x80u;` |
| **Function Pointer Indirect Call** | `v56 = ((int (__cdecl *)(int, int, int, int, int, int *, int, int, int))v44[48297])(...)` |
| **Loop-based Processing** | Multiple `while` loops with complex conditions |
### Algorithm Identification
**No well-known cryptographic algorithms** (AES, RSA, etc.) are directly visible in this snippet. The code appears to be:
- **Custom obfuscation** for payload execution
- **Process injection** mechanism
- **Memory manipulation** for code execution
---
## 3. Indicators of Compromise (IOCs)
### Observed IOCs
| IOC Type | Value | Confidence |
|----------|-------|------------|
| **TLS Index Value** | `206634064` (0x0C5A0000) | Medium |
| **Function Pointer Offset** | `48297`, `48298`, `48299`, `48300` | Medium |
| **Memory Offset** | `dword_425000[-36864]` | Low |
| **Bit Offset** | `543`, `583` | Low |
### Missing IOCs (Not Present in Snippet)
- ❌ File paths
- ❌ IP addresses
- ❌ Domains
- ❌ Registry keys
- ❌ Commands/scripts
**Note**: This code snippet is heavily obfuscated and does not contain clear IOCs. Full analysis would require examining the complete binary.
---
## 4. MITRE ATT&CK Mapping
| Technique ID | Technique Name | Evidence |
|--------------|----------------|----------|
| **T1055.001** | Process Injection - DLL Injection | Function pointer array and TLS manipulation suggest DLL injection mechanism |
| **T1055.004** | Process Injection - Thread Injection | Memory allocation and function calls suggest thread-based injection |
| **T1059** | Command and Scripting Interpreter | Indirect function calls may execute shellcode or commands |
| **T1573** | Encrypted Channel | Bit manipulation and memory operations may be part of encryption/decryption |
| **T1070** | Indicator Removal | Bit flag manipulation (`&= ~0x80u`) may be used to clear indicators |
### Justification
1. **T1055.001**: The function pointer array at offsets 48297-48300 is characteristic of DLL injection stubs.
2. **T1055.004**: Memory allocation of 4096 bytes with function pointer calls suggests thread injection.
3. **T1070**: Bit flag manipulation (`&= ~0x80u`) may be used to clear memory indicators.
---
## 5. Obfuscation and Evasion Techniques
### Observed Obfuscation
| Technique | Evidence |
|-----------|----------|
| **Indirect Function Calls** | `v44[48297]`, `v44[48298]`, etc. |
| **Variable Renaming** | `v3`, `v4`, `v5`... (generic names) |
| **TLS Manipulation** | `TlsIndex[0] = 206634064;` |
| **Bit Manipulation** | `*((_BYTE *)v62 + 543) &= ~0x80u;` |
| **Complex Control Flow** | Multiple nested loops with complex conditions |
| **Memory Obfuscation** | `dword_425000[-36864]` offset access |
### Evasion Techniques
1. **Anti-Analysis**: The decompiler warning `// positive sp value has been detected, the output may be wrong!` suggests the code may be designed to confuse static analysis.
2. **Memory Protection**: Bit flag manipulation may be used to clear memory indicators.
3. **Indirect Execution**: Function pointer arrays make static analysis more difficult.
---
## 6. Facts vs. Inferences
### Observed Facts (Directly from Code)
```
✓ Function signature: start(int a1, int a2, int a3)
✓ TLS Index manipulation: TlsIndex[0] = 206634064
✓ Function pointer array: v44[48297], v44[48298], v44[48299], v44[48300]
✓ Memory allocation: v61(v44 - 1024, 4096, 4, &v64)
✓ Bit manipulation: *((_BYTE *)v62 + 543) &= ~0x80u;
✓ Data reference: dword_425000[-36864]
✓ Multiple nested loops with complex conditions
```
### Inferred Behavior (Reasoning)
```
✗ Process injection is occurring
✗ DLL injection is being performed
✗ Shellcode execution is happening
✗ API hooking is in place
✗ Payload decryption is occurring
✗ This is malware
```
**Note**: The inferences are based on patterns commonly seen in malware, but cannot be confirmed without dynamic analysis or full binary context.
---
## Recommendations for Security Professionals
1. **Do not execute** this code in any environment
2. **Full binary analysis** is required for complete IOC extraction
3. **Dynamic analysis** in sandbox environment recommended
4. **Network monitoring** for C2 communication
5. **Memory forensics** to identify injected code
---
## Summary
This code snippet exhibits **multiple indicators of malicious activity** including:
- TLS manipulation
- Indirect function calls
- Memory allocation patterns
- Bit flag manipulation
However, **no clear IOCs** (file paths, IPs, domains, registry keys) are present in this snippet alone. Full analysis of the complete binary is required for comprehensive threat intelligence.
**Confidence Level**: Medium (based on code patterns, not complete IOC extraction)
**Recommended Action**: Treat as potential malware, isolate affected systems, and conduct full forensic analysis.
{
"understanding_point": "data unpacking",
"full_evaluation": "The understanding point is 'data unpacking', which would refer to the malware decompressing or extracting packed data/payload. The summary mentions some related concepts: it infers 'Payload Execution: The nested loops and conditional logic suggest payload execution or decryption' and lists 'Payload decryption is occurring' as an inference. It also mentions 'Custom obfuscation for payload execution'. However, these references are about decryption/payload execution rather than specifically about unpacking data. The summary explicitly marks decryption/payload execution as unconfirmed inferences (marked with ✗ in the inferences section), and never commits to actual data unpacking. There is no clear statement that the code unpacks compressed or packed data into memory. The mentions are vague, speculative, and weaker than a clear assertion of data unpacking. Thus the point is touched on tangentially but not committed to.",
"explanation": "The summary only speculatively references payload decryption and obfuscation, explicitly marking these as unconfirmed inferences, and never clearly states or implies that the malware performs data unpacking.",
"evidence": "Payload Execution: The nested loops and conditional logic suggest payload execution or decryption.",
"support_strength": 1,
"satisfied": "false"
}
{
"understanding_point": "data unpacking",
"full_evaluation": "The summary explicitly mentions \"payload decryption\" multiple times under \"Inferred Behavior\" and \"Facts vs. Inferences\". Decryption is a specific form of data unpacking. Additionally, it states that the code appears to be \"Custom obfuscation for payload execution,\" which implies that the obfuscated payload would need to be unpacked or deobfuscated before execution. These statements clearly cover the concept of data unpacking.",
"explanation": "The summary explicitly states \"payload decryption is occurring\" and mentions \"custom obfuscation for payload execution,\" both of which are direct forms or strong implications of data unpacking.",
"evidence": "Payload decryption is occurring",
"support_strength": 3,
"satisfied": "true"
}
{
"understanding_point": "data unpacking",
"full_evaluation": "The candidate summary does not clearly state that the malware performs data unpacking. It mentions related concepts such as memory allocation, memory copy, loop-based processing, custom obfuscation, payload execution or decryption, and memory manipulation for code execution. However, none of these explicitly commit to data unpacking, and decryption or obfuscation is not necessarily equivalent to unpacking. The summary even lists \"Payload decryption is occurring\" under inferences that cannot be confirmed, which weakens rather than establishes the point. Therefore, the understanding point is only loosely related to the content but is not clearly stated or implied.",
"explanation": "The summary discusses obfuscation, memory manipulation, and possible payload decryption, but it never clearly states or implies data unpacking. Related behavior is mentioned, but the specific point is not established.",
"evidence": "The nested loops and conditional logic suggest payload execution or decryption.",
"support_strength": 1,
"satisfied": "false"
}