Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bf7c4bf955b4d20b…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 893df9500bcc8b5e9f42b0a5176aff3c SHA-1: b0048e474b4a9e643825af4130537a4af6646923 SHA-256: bf7c4bf955b4d20b0a1d61bd79399a0f93b220e7f4e41b1ea0914415c2edc470
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 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
b030512296b37e23e78033206d302856d01f87b7422f4ed0c20e281e52d2f025		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
2b2e3a618a95a560078cbda15935c4dd2abe4f4a40089624e59771ffb0df0dca		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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