Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7639113779032de1…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f69e050deb043c457c4701ebb2ac4644 SHA-1: 80f5a1b07afdf90dcf43283f4c96e94b20922527 SHA-256: 7639113779032de184013e5d8bca321d795502b41eae837607b8c44f34c70613
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The GetObject call further supports the possibility of object manipulation for malicious purposes. The primary function of the VBA appears to be decoding and executing further stages, likely involving a payload download.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f0c2b99a970ccf60e296fb0485b329f3dcb53b535c4d58380df2bce7d85f87ed		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c4f831d0dfdabb3710edafa95832e35db8611d685b740a42a6c7b0b9e15344ea		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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