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

Static analysis result for SHA-256 184d29dc3f61be7e…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-08-04
MD5: ac79af16f18d7caac4ae30d3e931ae56 SHA-1: 8cfc4365f1c93c8d56c854dffd41d2270c66f3bf SHA-256: 184d29dc3f61be7eae40a6b38ec4ce6ea0c10eeb141d6f81252488d5269af1b2
370 Risk Score

Malware Insights

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

The Workbook_Open macro executes a command that downloads and saves a file named 'Pluvjyujin.exe.exe' from the URL http://sullivanbodhrans.com/shadowbox/shadowbox-3.0.3/nonand.exe using certutil.exe, and then executes it. This indicates the document is a dropper for a second-stage payload. 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://sullivanbodhrans.com/shadowbox/shadowbox-3.0.3/nonand.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
e34c12670b24abd19ba0491750d64b5f6224a6cc2fb559f2ccf53ff28412d81e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1423 bytes
vbaProject_00.bin
d9414aed24dc40ad95366fbc1bb99f1428952db7c8c401c5f9b4ea0ad9d62d89		 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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