Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 64381683c736af55…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: dd451f3f793751dde38ef015501b43be SHA-1: 2d38a96fbf58ae0c81502bbccc4baea6c9326651 SHA-256: 64381683c736af55d729418d84eb989fa194f158e22af78fe944ea9e705336e6
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests the execution of external code. The VBA macro itself appears to be a Base64 decoder, indicating it's likely used to obfuscate and execute a second-stage payload. The primary IOCs are the embedded macro file and the VBA project file.

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
5b90585b0721f1c758a616def047fcf430cb55aa721eeb4f2abc98d6441dd4f8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
78e48f6554cd2affe932031d565cf1130c85df921178bab8cd5cb9a19b63304a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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