Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ffeeeffbf5b52d77…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ca2ae3f8c60980ca7228d4c173879bc2 SHA-1: 4836e7140ebd176dc7bb9ae793e61ad16e6dfb62 SHA-256: ffeeeffbf5b52d77c12272167fbea6324a09f73cb1c40a0bea2cad6e9699e756
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 download and execute a second-stage payload. The specific obfuscation and lack of clear URLs prevent further analysis of the payload or its delivery mechanism.

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
4d0cc2d14174d3d7f969429357d324344dbc6b390dab696bcba0498fa0c058bf		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2ae7b08a01edd5c45506424e29de1d74b897017759620f547f0665c6df8276c8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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