Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4ace420723426e67…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d6cafd8695e4587cd77cc2e4922a69d4 SHA-1: 0f4038c7460470fc1ec2e2b0ef6f90d9326f0750 SHA-256: 4ace420723426e67be51d314336757cc81ea050f9d028084cebb119ccf1a59cb
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA code. The presence of a VBA project and the specific heuristics suggest the macro is designed to execute commands, likely for downloading and executing a second-stage payload. The GetObject call heuristic further supports the possibility of object manipulation for malicious purposes.

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
9c457e59a4b43a3d1172c2651d480c903f6a78c23b82c0a202ae1cdcb5d19ef3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
59afc34b026f30f12abc4967ec74dfdad48a416c759ce0f3d6c0311b3852f5cb		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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