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

Static analysis result for SHA-256 4fa5cdb10d2e582e…

MALICIOUS

Office (OOXML) / .XLSM

136.7 KB
MD5: aeac0ea1b585085965ba719da2337b44 SHA-1: ae3a303f80e53e2b96ef2d43840c72bf192000bb SHA-256: 4fa5cdb10d2e582e3f956bc7e87a1ff4a45d2400dd19556304672ea7bcdfaa7e
220 Risk Score

Malware Insights

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

The sample is an XLSM file containing VBA macros. The document body explicitly contains a PowerShell command designed to download an executable from 'sparepartiran.com' and execute it. This indicates the file's primary purpose is to act as a downloader for a second-stage payload. The presence of VBA macros and the explicit PowerShell execution command strongly suggest malicious intent.

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://sparepartiran.com/js/2Q/Vmvbtbdt2.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2a2a74e4bb0ff65c29d875c2c394b426dbf2bc1e67229cf567170b901a44e1ae		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1700 bytes
vbaProject_00.bin
f8057d64f0cbe77ee1ae029fac16a3305e8f79bd1a5a9fb0b08065ddfcfead00		 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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