Office (OLE) malware analysis — malicious · 58d92e73bd2cb063

MALICIOUS

Office (OLE)

89.0 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel

MD5: d31aba713ce409113ab9f85b3a5f2666 SHA-1: db239bb57bd4f539ac50de710a9a7cbd21b6ff80 SHA-256: 58d92e73bd2cb06379e3f19a1794fedc90b51b1b807796a98b9bb72a4b2ff12c

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1218.011 System Binary Proxy Execution: Rundll32 T1055.001 Process Injection: Dynamic-link Library Injection T1055.012 Process Injection: Process Hollowing

The file is an Excel OLE document with a significant amount of slack space, suggesting hidden or packed content. Heuristics indicate the use of Windows API functions commonly associated with process manipulation and execution, such as WinExec, CreateProcess, VirtualAlloc, LoadLibrary, and GetProcAddress. The presence of a suspicious cmd.exe invocation further supports malicious intent. The document body presents itself as various application forms, a common lure for social engineering.

Heuristics 7

Reference to WinExec API high SC_STR_WINEXEC

Reference to WinExec API
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Suspicious cmd.exe invocation with execution flag high SC_STR_CMD

Suspicious cmd.exe invocation with execution flag
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 91,136 bytes but its declared streams total only 21,308 bytes — 69,828 bytes (77%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API

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