Moffas — Office (OLE) / .EXE malware analysis

Static analysis result for SHA-256 2704bc32175a9c76…

MALICIOUS

Office (OLE) / .EXE

42.5 KB Created: 2001-04-27 19:03:00 Authoring application: Microsoft Word 8.0
MD5: 2df0c33f6ab22136bee16ee24c99198b SHA-1: 4023e2b18e30258b719963e65883dfe3c7dc2aba SHA-256: 2704bc32175a9c76f0a47a6ef77a10e8e49caeba75cb78004809b897f15a647b
340 Risk Score

Malware Insights

Moffas · confidence 95%

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.Worm.Moffas-1'. Static analysis reveals the presence of VBA macros, including AutoOpen and Auto_Close, which are commonly used to execute malicious code upon opening or closing a document. The 'CreateObject' call and VBA p-code auto-execution further indicate malicious intent. The 'S.P.R.E.A.D.' string suggests a worm-like behavior, potentially spreading via email.

Heuristics 8

  • ClamAV: Win.Worm.Moffas-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Worm.Moffas-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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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
b72592a1080aebfce2fb6951da74dfbb22d3358960f5a8ed26ead76aeba09c15		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 20536 bytes
Detection
ClamAV: Win.Worm.Moffas-1
Obfuscation or payload: likely
Carved artifact contains 8 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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