Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 1f2a1d2ae2401bab…

MALICIOUS

Office (OOXML) / .XLSM

96.5 KB
MD5: b31e1eccf607672531557bce770fb532 SHA-1: 42fea59e7c0b60a176eac95933748d53dc625fa0 SHA-256: 1f2a1d2ae2401bab5c2d7c3d6062ddc4af9517e0f99bf89e6b6cd02a70bcd0e2
260 Risk Score

Malware Insights

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

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. ClamAV detections indicate it is a dropper, likely designed to download and execute a secondary payload. The presence of a 'macros.bas' file further supports the macro-based execution vector.

Heuristics 6

  • ClamAV: Xls.Dropper.Generic-9823786-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Generic-9823786-0
  • 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
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2b4669dcc5db6e7c1f88131d0a807e6d4341c1e7bbbb291e204309b52d4afddd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7791 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
477ef5ee0a4f779161ae63588ba61e3a4aa85faf9283febff203a06b84a5f3f8		 vba-project OOXML VBA project: xl/vbaProject.bin 7680 bytes
Detection
ClamAV: Xls.Malware.Sagent-10035294-0
Obfuscation or payload: unlikely

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