Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fc2c5193a43f5e06…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a7a43c68b2bd9fbedeadd46f5d1a8fd7 SHA-1: f2c6a5cce82ac824bc0202b583848061fa4502ec SHA-256: fc2c5193a43f5e06c53bd6a1623f4b1ec1bc7052da4762558961fe1f25acd42c
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 GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code appears to be obfuscated, but the references to PowerShell and cmd.exe indicate a likely intent to download and execute a second-stage payload. The file was likely delivered as a spearphishing attachment.

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
89825abfbeab541146c0f60dd7d916fdbcf1e3ab1e3bc4e9c881a377b71484da		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a56af0957745c42597551878ba3f35ca3f91e160729761515c30862c17420ece		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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