Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2b8112c21ff5d411…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 52a4e8f65b0f72f14c9a5b52c819d9a7 SHA-1: e0b15763c573f4306cf97dccc120d42a0f2bf8e2 SHA-256: 2b8112c21ff5d41135879a28a7bb188ca80400fdb1135f0f46fcaa83d05731d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. 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 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
281b627b4502e843c05d333d390c1f0cca1608fcea0b783213846f39bad4ebc9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
2e5c4424d85ed10e9cc94027c0a263eaf3970c6645fb9f9b7bc0d7798d223415		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.