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

Static analysis result for SHA-256 e0ca6e1db5a74e9a…

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: 70be7435bf56bd3c1d9a9dbcff409865 SHA-1: 650482f56704067fc07b82e50f73329d49f1b80c SHA-256: e0ca6e1db5a74e9a6489218d6132d8141885fd5878772c9d4f9d7cda35c94644
382 Risk Score

Malware Insights

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

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 script from the URL http://3.110.216.64/pray/rlx/loader/uploads/TMP1034605033.bat and then executes it. The downloaded batch script is named Wiaysmlistdskipmemhtlo.exe.exe, indicating a likely dropper or downloader functionality.

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://3.110.216.64/pray/rlx/loader/uploads/TMP1034605033.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4ddcefe5ddbda57fd5a05c28a176614743ee5d714485d5b3b53fbd8ef4889570		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1140 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
0c7b9a15dd46bc10efa6bee66d91f4da206f68e25d77d9dbacd42c4f98274d51		 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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