Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a863cd1691096000…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 584677dc533308474fcbd9a704e9ee0c SHA-1: dc2913834fd9d30ffb8e3dd2c97bb58ff163d66d SHA-256: a863cd169109600049571938f25f36879d1c731a59e34dbda02359ccbbcbd951
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating a likely downloader or stager for a second-stage payload.

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
ecf518a0c0ca89917284f02e9de62dc49a75c50ab922672e113837e4a4e115d4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
f2b2d318c830d52f19ef8eeda767561f74d7d21c3f1525233598375819e442ad		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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