Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c2af1d58b726a51d…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8d31db8fce494cbdb38d4f928ed00a9f SHA-1: 9e8aed16954355a4125afce9e3aeec246cd7d0e6 SHA-256: c2af1d58b726a51d56c2b5fabcce7f3f71d347b15557428746793a648cc1e0a5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This Excel document contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscation, commonly used to hide malicious payloads. The primary goal is likely to download and execute a secondary payload from a remote source.

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
c22845eb5e87462dd0ddc71777673d33b3581e45c4d4622dd50ebf9df4966c49		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
473387fc8d89f8e914316f54910058d7390ff9e735e8b0296b80625871c92354		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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