Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a568ddf82e58cbb…

MALICIOUS

Office (OLE)

590.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel First seen: 2012-07-12
MD5: 1c60f71b6787f389b04132e06529fffb SHA-1: d29ff5336343790d53b5b2986218339ab89556c6 SHA-256: 6a568ddf82e58cbb683ccc903665d967217a87f58a2edfff341afcd418a3605a
640 Risk Score

Heuristics 13

  • CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129
    Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=23, isf=2, cbHdrData=4294967295). Legitimate FEATHEADER records are tiny (<100 bytes) and carry cbHdrData values that fit in the record body; the value here is the documented CVE-2009-3129 exploit primitive — cbHdrData drives a memcpy with attacker-controlled size, leading to memory corruption and code execution in Excel 2007/2003.
  • ClamAV: Win.Trojan.Neshgaig-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Neshgaig-1
  • Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY
    Reference to WriteProcessMemory API
  • Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD
    Reference to CreateRemoteThread API
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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 604,247 bytes but its declared streams total only 24,565 bytes — 579,682 bytes (96%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_0001573f.exe embedded-pe Office MZ+PE at offset 0x1573F 516376 bytes
SHA-256: cce0bb4e0538c26d91381628d958b481b2220d758c9bd3c881afcc3d9e0ac76b
Detection
ClamAV: Win.Trojan.Neshgaig-1
Obfuscation or payload: unlikely

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