Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1f589b7927b403a9…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 215a57e9484569919196bbbea43e3fbd SHA-1: bc1869cc3675254d13a18d9bebae779cbfd4023b SHA-256: 1f589b7927b403a9af9b2878cdc7d8fde25ce462e25dff7fc7680303e35bc754
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 OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a second-stage payload. The specific obfuscation and lack of clear URLs prevent further analysis of the payload's destination.

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
6d4ba1ce2ed62aa19757d0107477f5ebe467f89487b4cab4ba36b88566c13488		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f62958064ff26f6b008ac16b397468fde73288ffb8977de204d2f492134cfbc6		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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