Office (OOXML) malware analysis — malicious · 0b7eaa362284b36b

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: bd7edf8f1cead89ded62f2a3fe26d942 SHA-1: e9eda8c17ce012aaec42c971f815059e78354110 SHA-256: 0b7eaa362284b36b4aafacfb920decec052022cd6b1b9189a7327efcbdfa859c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell 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 contains obfuscated Base64 decoding logic, suggesting it's designed to download and execute a secondary payload. The presence of these elements strongly indicates a malicious macro downloader.

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.

Filename	Kind	Source	Size
`macros.bas` `022701f814575265eb5adb4301957229da6efc389c0713745a9027648967895a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `050a1867bc6be5b47ec7a460cf13878dac46cfc83a242886c2755d1637d11de0`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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