Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 86e13c09c83d8d4e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1dd5e31cab0a04e7f2194319eb149c59 SHA-1: 0f4f41c8286974d1a3625dcace3625204aea4e42 SHA-256: 86e13c09c83d8d4e2449e443c1774e3bc11238a382e153c6551f83e7397227ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an OOXML document containing VBA macros. Heuristics indicate the presence of VBA macros, references to PowerShell, and calls to cmd.exe and GetObject. The VBA code appears to be obfuscated, but the presence of these indicators strongly suggests an attempt to download and execute a secondary payload. The GetObject call is often used to instantiate COM objects that can then be used to launch external processes.

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
8c36561701308e8a2019ef76a831f4d6ff982130a19adc7e8a970161e1d5a47c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
dd8847a065aceaffab3dd0ce21eb235f200b1fead190bb63e6213ed5e6667746		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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