Office (OOXML) malware analysis — malicious · 9fb27c8edccd2c1f

MALICIOUS

Office (OOXML)

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

MD5: da4bd20909b623aec32123677399f48f SHA-1: 62ef424335e51c8285306a9e0abc5a68569eacce SHA-256: 9fb27c8edccd2c1ffab7c213aec55c0a72147d6650e4b42d2a462746a60bc98e

160 Risk Score

Malware Insights

MITRE ATT&CK

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

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call is also suspicious. The VBA code appears to be obfuscated, but the presence of these indicators suggests the macro is designed to download and execute a second-stage payload. The Base64 decoding function is likely used to obfuscate the actual commands or URLs.

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` `56decf2b78492190919902cc1031b58651a8a8257f28a3f89adbfc1606d1a16f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `ddce8556989e065a3d2c3e4413374d59752a1bbcb99699b8768ed15eba37e701`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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