Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 38a1adbf828ca597…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6fee9552891b39280288e58cf88539b8 SHA-1: b1bef6c8d2a9922a31f54fa9cce1cc1385822710 SHA-256: 38a1adbf828ca5973c4f41bb6f5d649913156e3c25485131fc2ed65b579cb005
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 VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be heavily obfuscated, but its presence and the references to scripting interpreters suggest it is designed to download and execute a second-stage payload. The specific family is not identifiable from the provided evidence.

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
23808c4e6eb64a0d9d90b8fc97df968e5e52e6d2adc73b5700dfbd6eb07780ca		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
64c64a02316cd8c226f62749e3e6c20ff0eb2afdc0902dd8d26e1aa4e2456810		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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