Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 161355db11534b26…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a522143f17c83e14f21c153d75b1243b SHA-1: 684703c0ad6c13a01093ced1139ef079f84e3080 SHA-256: 161355db11534b26404128520c8e8ba75ee5336296a0380b2098add85afc9092
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, along with a GetObject call. The VBA macro itself appears to be obfuscated, but its likely purpose is to execute PowerShell commands. This suggests a downloader or dropper functionality, aiming to fetch and execute 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
195fc816d81a5662b2f521f60ee96b049568af34108309cff4bcad7916d3f390		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
54ff88f417435a14704c9a3684111300c91981c5232a000ccd0d8841aa5e0613		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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