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

Static analysis result for SHA-256 6f033029c7437455…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-27
MD5: 3894f21e1454137a3f29eba54185b67a SHA-1: 3fad8ddd53a9353bbc6ea3f0e648e3d2d4583c6d SHA-256: 6f033029c7437455250f86d2cc3958f57e58269c0a6b72d73b17eff908e76556
370 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell

The Workbook_Open macro executes a command to download a second-stage executable from 'https://random1.x24hr.com/k/Olusvpn.exe' using certutil.exe and then executes it. This indicates a dropper functionality, aiming to download and run further malicious payloads. The document body contains a lure to enable content, which is a common tactic for macro-based malware.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • 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
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • External hyperlinks (3) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://go.microsoft.com/fwlink/?LinkId=846285
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://go.microsoft.com/fwlink/?LinkId=846285
    • http://go.microsoft.com/fwlink/?LinkId=844969
    • https://random1.x24hr.com/k/Olusvpn.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0668532e2616065ad060a2362fa9ff49e6d8adb384b4273e8819c295cd86edd5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1422 bytes
vbaProject_00.bin
2fb646538086b62c7d8e93afcefd374a99ffa257e12ae5684ddfb3b84571d0cb		 vba-project OOXML VBA project: xl/vbaProject.bin 6144 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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