Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8a1b0f7959d4b024…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d774a2c610c730a44ec348d454ac782a SHA-1: ea10cc18dcb25bcd015305a72afa0faa47f04afb SHA-256: 8a1b0f7959d4b0249a6ce3e0301f18e204a8e3b2f06ecffb27706d70e75034d8
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. Critical and high severity heuristics indicate the VBA code references cmd.exe and PowerShell, and uses GetObject. The VBA code appears to be obfuscated, but the presence of these references strongly suggests the macro's purpose is to download and execute a secondary payload. The Decode64 function is likely used to deobfuscate malicious content.

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
dfaabc1702ede310b9ccd9dc38319773f1bb6a6da18d09ea55c73dad2191ca1b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
4571d2c4e8fa423a2d7f596d01163febf888932605c069c43321de07ef7da8c8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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