Office (OOXML) malware analysis — malicious · 229979c8b88f82c8

MALICIOUS

Office (OOXML)

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

MD5: 8ad34c52483f6b588cdaedf8f2ca29bc SHA-1: 2cb03ef903a2daaea45d57662a6ddb20c4ff3d68 SHA-256: 229979c8b88f82c8950bad6a32263a37eb5906a83df9def360967b6f25019aaa

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample is an Office document containing VBA macros. Heuristics indicate the macros reference PowerShell and cmd.exe, and use GetObject, suggesting an attempt to execute arbitrary code. The VBA code itself appears to be obfuscated Base64 decoding, likely intended to download and execute a second-stage payload. This points to a macro-based downloader, commonly delivered via spearphishing attachments.

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` `aea3b60df10ee6e628d11440dd8868b05f755ce18f756ff6691ae21ffb48ae03`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `9f3d02167ffb152015849de04515837c574a126bd908a361e2c33bf85c360fef`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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