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

Static analysis result for SHA-256 84cf94c3e44fb62e…

MALICIOUS

Office (OOXML) / .XLSM

21.6 KB
MD5: ae9dfa8376a3ae9e8d7a80b639a1e909 SHA-1: ff740fe5fe1e7955296549ce2647e1259149b631 SHA-256: 84cf94c3e44fb62ed88478948ec667760e5723e7d986c3cb20eaf38f32de140e
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing VBA macros that leverage CreateObject to execute a PowerShell command. This PowerShell command downloads an executable from http://185.212.128.97/Clhwv8.exe and saves it as C:\Users\Public\cqyeqexdf.exe, then executes it. This indicates a downloader or droppper functionality.

Heuristics 6

  • ClamAV: Xls.Malware.Sagent-10035294-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sagent-10035294-0
  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://185.212.128.97/Clhwv8.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6601ede21f7690559c661af68115595b847c8e4db7b91417f2b6bf93e6d30b14		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1310 bytes
vbaProject_00.bin
f2dc54fea4541507945727b4a82932bc23219fa1249040218f06fd1b9ff108a0		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Malware.Sagent-10035294-0
Obfuscation or payload: unlikely

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