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

Static analysis result for SHA-256 7637a06005c3e90c…

MALICIOUS

Office (OOXML) / .XLSM

719.0 KB Created: 2023-01-22 11:25:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-02
MD5: 3064726b643cf933c803d572ae56e925 SHA-1: af73eee09bfe11fe8475aec38d7742215432b063 SHA-256: 7637a06005c3e90cedae65054c0458d02a66865e1f91c61b5b7ba1ccf3303587
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro. This macro utilizes WScript.Shell and PowerShell to download a second-stage executable from the URL http://3.73.132.53/hz/Etolfsojm.exe and execute it. The ClamAV detection name 'Xls.Dropper.EPPlus-9802867-2' further indicates its dropper functionality.

Heuristics 9

  • 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
  • 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://3.73.132.53/hz/Etolfsojm.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b21635fcb99d3607aace150623b23883ea835dd7e73d25101d0a035d082cee6c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1241 bytes
vbaProject_00.bin
8952b2de563dc3cf02435f93cd22d8c11c3d1c7dfbd0150b9d72a021c65c3de7		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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