Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cdd450da5de9f15f…

MALICIOUS

Office (OLE)

45.0 KB Created: 1998-12-11 15:01:00 Authoring application: Microsoft Word 8.0
MD5: 22b15aef255e9a53f6c51637c78c0bfb SHA-1: 2904f5f3a8cf34c02ae5df08c43fb4c22dca6560 SHA-256: cdd450da5de9f15fd570dad693281a23966aa0a64e6af74720d74eb81e17e3a9
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Doc.Trojan.Caligula-1. Static analysis revealed the presence of VBA macros, including an Auto_Close macro, and a Shell() call within the VBA code. This indicates the macro is designed to execute arbitrary commands upon document closure, likely to download and execute a second-stage payload. The document body contains references to 'Caligula' and 'CodeBreakers', potentially hinting at the malware's origin or name.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Caligula-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Caligula-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
48f48716c2b639961766a4c3d75e0355115fdd96658c7b622c3a4bb85f09c972		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11110 bytes
Detection
ClamAV: Doc.Trojan.Caligula-1
Obfuscation or payload: unlikely

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