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

Static analysis result for SHA-256 3ff1a435a0ca5ff3…

MALICIOUS

Office (OOXML) / .XLSM

431.1 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-18
MD5: 9820091637aa0b3a32af4eacddd864aa SHA-1: 9aa380c934870fd031fb34913d639d64477f8d1c SHA-256: 3ff1a435a0ca5ff3346ef2663f83d8c472687078c2d20c0a567aefe91006ee10
382 Risk Score

Malware Insights

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

The sample is an XLSM file containing a Workbook_Open macro that executes a command using cmd.exe. This command leverages certutil.exe to download a batch file from the URL http://49.12.244.154/fs-1d/wd/loader/uploads/QTN01000037522.bat and then executes it. This indicates the file's purpose is to act as a downloader for further malicious payloads.

Heuristics 9

  • 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
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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://49.12.244.154/fs-1d/wd/loader/uploads/QTN01000037522.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b5f9b4d3989c1c77af59e2886b1021d724332eeb09c9730733243f1630b1693d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1118 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
098c2d8f86f84b7258041a6f0fc9fa316f2e3cff4f2db305ca4a9e8bbf1b0cce		 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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