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

Static analysis result for SHA-256 26071ca36324d8fc…

MALICIOUS

Office (OLE) / .EXE

39.0 KB Created: 1999-02-23 04:38:00 Authoring application: Microsoft Word 8.0
MD5: 13f0ecfe27176a69427be13707de7ca8 SHA-1: 1dfe949facbc505e2aa2247ca861aae68fde7646 SHA-256: 26071ca36324d8fc643a084ca57f7e6b712cb38c576738e51c2586755651cd17
340 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 Win.Trojan.Tristate-2. Static analysis reveals the presence of VBA macros, specifically a Workbook_Open auto-execution macro. This macro utilizes CreateObject and GetObject calls, indicating an attempt to execute arbitrary code. The presence of obfuscated VBA strings and the auto-execution of code strongly suggest the sample is designed to download and run a secondary payload. The extracted ClamAV signatures further corroborate its malicious nature.

Heuristics 8

  • ClamAV: Win.Trojan.Tristate-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Tristate-2
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
f4f19382c63d4a286a5b9f8ad81fe131b20633a4c8604d047e5d95fdb71872c6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9744 bytes
Detection
ClamAV: Doc.Trojan.Tristate-1
Obfuscation or payload: likely
Carved artifact contains 12 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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