Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c50019369fc31799…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8c755aed23dd3081c2c638b554565dfa SHA-1: e18ebd693744792963601ed041f8920b362b946c SHA-256: c50019369fc31799b1acee50c8f326868a07c3e89e26108f1d5f7e8966a75f38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The GetObject call further supports the likelihood of object instantiation for malicious purposes. The primary function of the VBA appears to be decoding and executing further code, likely to download and run a second-stage payload.

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
cea6d95fac4398495be543ee7b272943acaffda91c0aa3c1ee4e70cb38093b03		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
1bf32495d45389dded113484e37ea4e12659a30e629cba2eb0e4d4723f2c35c2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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