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

Static analysis result for SHA-256 4a5e25c3438b7613…

MALICIOUS

Office (OOXML) / .XLSM

42.1 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-04-19
MD5: 085e42c1d3b9e1ff4ab0fbb281db1973 SHA-1: 85254d8a790d17f8086a20fcb0a66ec9b2002ef5 SHA-256: 4a5e25c3438b7613bfdbeb0ccc6a98ccf756cbd81ca8b6caa92017f384ac22de
430 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The Workbook_Open macro within the XLSM file executes a PowerShell command that downloads a second-stage executable from the URL http://alkebulansankofa.co.za/Uomwqqq.exe and then executes it. The document body contains a lure to enable content, which is a common tactic for macro-based malware delivery. The presence of WScript.Shell and CreateObject calls further supports the malicious intent.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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://alkebulansankofa.co.za/Uomwqqq.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
9eaea392a5002b3d9c49dca1668d935e13b7ddab326bc95a85365427692a08d7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1551 bytes
vbaProject_00.bin
4a01c2e005bcb0520d471f48fd09289d9d7bfef350127c687f059e94ce479fe3		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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