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

Static analysis result for SHA-256 c650c74af77ebec6…

MALICIOUS

Office (OOXML) / .XLSM

363.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-12-10
MD5: 9264094f57affe3c4f7175417a7ccbec SHA-1: 4e9b1f41f9a6c838df7111e98302141cdbc19ea9 SHA-256: c650c74af77ebec697af73a0d2444f810ba912e3c444ec3ed1765e6370d1cbaf
342 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 using cmd.exe to download a file from the URL http://35.158.94.112/fif/0698741002.exe and save it as Tadkgugxzpxqejfgidoao.exe.exe. This downloaded executable is then immediately executed. The use of certutil.exe for downloading and the direct execution of the downloaded file indicate a dropper functionality.

Heuristics 8

  • 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
  • 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://35.158.94.112/fif/0698741002.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
94fc48261b107cab17f4c3efdc0f00f4e0ed115521d47afcd4814ac8593d4f57		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1116 bytes
vbaProject_00.bin
5ff8295d6ce31e27830150c2d4542119ea1813122a35aae31ea2f9cb6eddff11		 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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