Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 77dd7e3e0292692e…

MALICIOUS

Office (OLE)

30.0 KB Created: 2005-10-09 19:31:00 Authoring application: Microsoft Word 10.1
MD5: d467aadafce3a488ef735286b8fe10fb SHA-1: c28c876ca6912fc55069c40163be3b6d9b95221c SHA-256: 77dd7e3e0292692e18d4388edbe82f72d30097510271ef62c0a403340fdab086
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing a VBA macro. The Document_Open macro is configured to execute a file named 'Server.exe' from the hardcoded path 'I:\Eudora\Sys\Server.exe'. This macro also attempts to log activity to 'I:\Rep.log'. The presence of the Shell() call and the auto-execution via Document_Open strongly indicate a malicious intent to run a secondary payload.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Replog-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Replog-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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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
5b65961cce31dcaec1bad414d2555d2ad3cc8e4d7da7280e5a5cc3b1d567ed3e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 834 bytes
Detection
ClamAV: Doc.Trojan.Replog-1
Obfuscation or payload: unlikely

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