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

Static analysis result for SHA-256 c20d1d13fddb96e7…

MALICIOUS

Office (OOXML) / .XLSM

398.4 KB
MD5: dc140c9631c2991a8aeff3beed9d94cd SHA-1: 783ea269afb3afa4c3d51feb79d29907fa4e1757 SHA-256: c20d1d13fddb96e7864749099eebdd27e2a5446a83ac76ad8751b6401d951ce3
220 Risk Score

Malware Insights

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

The file is an XLSM document containing VBA macros. The macros execute a PowerShell command to download an executable from 'http://139.28.36.119/yes.exe' and then execute it. This indicates a downloader or droppper functionality. ClamAV also detected this file as malicious.

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
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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://139.28.36.119/yes.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cb75df7a442c5ef9837d63e0e71ad0ffc90e397e25367cf363da0bf9d3f8d377		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2248 bytes
vbaProject_00.bin
20c3621520bf7e98540f125a1d59269b9b354dd7fc98f96a3d284a096c249ffb		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Malware.Sagent-10035294-0
Obfuscation or payload: unlikely

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