Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8951a074cc7d66bb…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4eddab9d8568746f0e2e6011b437dba0 SHA-1: 243b677582cdf8610ac0537424dfecc1dae33f25 SHA-256: 8951a074cc7d66bbe1396087d1e2e337880e15e59ba9faea394ecfa10b1f23c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call is also suspicious. The VBA code appears to be obfuscated, but its likely intent is to download and execute a second-stage payload. The specific family could not be determined due to the obfuscation.

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
8ef3bd93f3ebb2052524685b928ad90f631bd1921220884f4ed63b2d813c5e48		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
94cac1c6c5deb7b8cfa6c06813a74386f5999d6186a58681eb4f20f127469c4f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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