Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7c955ec1f695c73c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 97871e5d6d09d742fa3c36c246f3bb7e SHA-1: 0317471dc5afacf4ed13e12e1bb9edb1f0948b41 SHA-256: 7c955ec1f695c73cd371ccdeeba76aa5589479198c7a0ac1156c0d2997c0db50
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 presence of VBA macros, references to PowerShell, and calls to GetObject and cmd.exe. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators strongly suggests it's designed to download and execute a second-stage payload. The specific family is not identifiable from the provided evidence.

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
a178cffd3a7bf995707cbbe4712660ef6df95949bd1785161586a907f66b7485		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c7c00006ccbbd4ccf082b319799e5a4830c26bb0591364c13957183ae113c8ff		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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