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

Static analysis result for SHA-256 8ac37ca924c8fbee…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-11-17
MD5: 641f64ca0e5aa6d3897c8f1cc72382ae SHA-1: 84cbc19ea037d15f7a4e25fe465251dfb3cd3651 SHA-256: 8ac37ca924c8fbee84c160cdf5d71215a9f1727afd7906add01f3cfc9e81d590
370 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1059.001 PowerShell

The sample is an XLSM file containing a Workbook_Open macro that executes a command using cmd.exe. This command downloads and executes a file named 'chris.exe' from the URL http://192.3.194.246/chris.exe using certutil.exe. 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://192.3.194.246/chris.exe
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e29170b44b76b28fb4086780f5fb8c84eb05d71925ed5f46d95fb3086d815ef7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1391 bytes
vbaProject_00.bin
d685be61fb6520596d7a2a7e18f1690b4cbdddfebb3114314d51222d230d5e27		 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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