Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3937a4a47704f601…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 52b2df2b89aa2e880e4fcba7a662d6d0 SHA-1: 35a098475c781be1e183a929c4fb648bd83521f4 SHA-256: 3937a4a47704f60144f4adaf0534e89242205b5d9694c6f01e857c2b7f957504
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to decode and execute a payload. This is further supported by the critical heuristic firing for a PowerShell reference within the VBA code. The likely intent is to download and execute a second-stage payload, making the initial file a downloader.

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
690e3df4407a4c2977f2f62998f74526d528a5e761c00cfd63e9c0838bf46481		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ad15a9d0887a128fee4bbfd3099f9b705a1b272278f2b669216ee8cd9b4e34b1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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