Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a541dd67a195f109…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ebd774299eb7f81e2541672b7d16770e SHA-1: e06749c5b696384720d1486c98955b2a6679406e SHA-256: a541dd67a195f109af3b6f004507357c89c07ba2384ff8bb423ffaa50de0cfbc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

This 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 decoding function is complex and truncated, preventing a full analysis of its output.

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
a3147511516150ed555b41dff878dfd09be1ec0da1a2f9f897fcb6b7b807301f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
06ae65b9a7984a715417e6b000894ca9f8fe02fa3f1ef009ab12ed37899f03e7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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