Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 29f6b343a4bed5f4…

MALICIOUS

Office (OLE) / .DOC

221.3 KB
MD5: 6f70e1815fe09fad9346a45b95eeb3e6 SHA-1: 19a53eaaff30cf9d9f68ca0f7a1d4487bb4bf3d7 SHA-256: 29f6b343a4bed5f4f9ec9e07aaaac2827b0da74f767add7f1e4b0e321023aaba
320 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1071.001 Web Protocols T1105 Ingress Tool Transfer

The sample exhibits critical ClamAV detection as 'Xls.Dropper.Agent-7079673-0', indicating it functions as a dropper. High-severity heuristics for PEB access, WinExec, CreateProcess, and GetProcAddress APIs, along with a NOP sled, strongly suggest the execution of shellcode. The large slack space in the OLE structure is also anomalous. While no specific script content was provided, the combination of these indicators points to a malicious document designed to download and execute a second-stage payload.

Heuristics 8

  • ClamAV: Xls.Dropper.Agent-7079673-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7079673-0
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • Reference to WinExec API high SC_STR_WINEXEC
    Reference to WinExec API
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess 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 226,646 bytes but its declared streams total only 31,351 bytes — 195,295 bytes (86%) 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).
  • x86 push-string-call medium SC_PUSH_STRING
    Shellcode-style PUSH imm32 sequence builds an execution, network, or Windows API string on the stack

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