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

Static analysis result for SHA-256 71414c20e9101a9f…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-05-31
MD5: aa1617bd038ac32aa2bf4ae561454438 SHA-1: 217df48fcc2538d2ddfd8ab87821255a1fa508b9 SHA-256: 71414c20e9101a9f9e630f99fa0e0c080b0e3cbf4711fcaa99931354cdd663f2
370 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an Excel macro-enabled document (XLSM) that uses a Workbook_Open macro to execute a command. This command uses certutil to download and execute a file named PUTY.EXE from the URL http://2.58.149.2/PUTY.EXE. The document body contains a lure to enable content, common 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://2.58.149.2/PUTY.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
4f7bb9c2b0f656e0e0a07ee4fe9bd8559a7f3fc0bf66fb5af2e72b95831928ee		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1393 bytes
vbaProject_00.bin
1c11d957009097fffe1cd8aff02ab19eda9ff4aa28bb60a477aed7a51f1bc5f2		 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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