Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8bcb7f01cc341052…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: caa13fe76ba3f57c31162a1baa104421 SHA-1: 33a5e22798694810724c64640e170fa5a857a035 SHA-256: 8bcb7f01cc341052d71096ed3f26a3ea7e7dede572a0e39ecaf22c31e0f7bc05
160 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute commands. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern points to a macro-based downloader. The GetObject call further supports the execution of external code.

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
af14301a94f8c263bf655ba92b6e52dc5bc002e2facb97ae2e4aeb34282bf96a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5bedc94b5aac4f02a39a13927939d4f8eaee1c303238a2b7a74df0a1976f2a18		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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