Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 91747305ff5879eb…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 84561b5490e9618223998cedd4dd119a SHA-1: a7b6abe84e1b95e64f9fc35b18fd76cbd3af1b0e SHA-256: 91747305ff5879eb144535ca768d3a9f126e26486bfcc219b5dda7fa978e6f52
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 OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be heavily obfuscated, but its presence and the references to scripting interpreters suggest it's designed to download and execute a secondary payload. The specific obfuscation and lack of clear indicators prevent definitive family attribution.

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
ba4f12d4ecb6c01dee7fe18a298f8b37acf3a613c8980c757f426b501bdc1593		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
ef0945b19b3180b0a18deaa27886c7252d502c5852429d7f39f8b724a0a96893		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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