Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a6ea9d4afe1eb7e0…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9c847d1d1177754bd48e10f796d2280b SHA-1: a969e9e2fd74dea3e4341cae98f45f93230fc3b9 SHA-256: a6ea9d4afe1eb7e0bb4309467556852166bda952358977e6f58ffcd986d9b1ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute malicious code. The presence of a GetObject call further suggests the execution of external code. The VBA macro itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern suggests a downloader or dropper.

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
c8c69145ab8c012730be5092cc6fe38666f61188bce6e34923e30bdfef7e0272		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
2e871e575b558279e7caf34645d889e3fb65154c1904a9cffb6478e433e7ef85		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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