Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 be3777004505bd38…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2252aec3adb1e4eb197b59d43de415f7 SHA-1: de605d2b055119d1c69af49606a07ae2da3d62b6 SHA-256: be3777004505bd3808a8258165354360118b1875550758c5b7d6b52f917d0f9c
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project indicate that the macros are intended to be executed. The script's functionality appears to be Base64 decoding, suggesting it's part of a downloader or obfuscation mechanism 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
7bd0fd9f1fcbede683cd04c0b784a37684ea89abb7848d2abe95f7190ffd52f3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a0fdfc7da461613b44f7df78cc97803b7dfa090c5ac3eadd6e7003d40036cff3		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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