Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 910b0c9ff8a63551…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 775234331d53cc142fbb006b21106f93 SHA-1: e49bb74e18e58eb625db1a0eebce7aa15e08598a SHA-256: 910b0c9ff8a635517d7fb90befdc04e1aa88d38b24536b39c52f63aafaa7d9d8
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 VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it is likely used to obfuscate and download a second-stage payload. The specific purpose of the decoded payload is not clear from the provided evidence.

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
81714844d229cd3e43f0dcb7ca4a2d7949c4111db551bbf394214d632b79e99c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2092c68bbc81e52686079033a2e16b36c1d270ad9be1105901709e260f598d63		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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