Office (OOXML) malware analysis — malicious · aad9b53e365c0f29

MALICIOUS

Office (OOXML)

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

MD5: c615cd1a5a859263dea400b38be131f5 SHA-1: 7766c63d2512b035516287ff1b80f19d7c0dbaad SHA-256: aad9b53e365c0f296dad4031dc1d8d2193328ca12d99d1128f95c424dae7ef53

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call is also suspicious. These indicators suggest the macro is designed to download and execute a secondary payload, a common technique for initial access and further infection. The VBA code itself appears to be a Base64 decoder, likely used to obfuscate the actual payload or command.

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` `b071f8007224d47202005fda4e30f6c57946b4c78047461d99d401b0597ae2e8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `02ac090f6aa8d60761c745a3f39c025dfefa1a9bf886dc0b9838b5e7254e8a8b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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