Office (OOXML) malware analysis — malicious · fc487122334d7978

MALICIOUS

Office (OOXML)

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

MD5: 85d24a5a2c5b4e2c8e90404ad22bf8e2 SHA-1: 8f2afe2fccd146328e741d23a1167328a4b03309 SHA-256: fc487122334d79787ce92219681e693f240502a49391ca371b8a5f27e7d59124

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

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 a Base64 decoder, suggesting it is used to obfuscate a payload that is likely executed via PowerShell or cmd.exe. The primary function of the script is to decode and execute a secondary payload.

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` `847be6217ee7ec5a9b4b44d8e70c4485d2a4efc4f17fe27c13d33760c6e42a9a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `931446ae3540afac7b466527ee9e6c60003ddc335c4009aa33e95ed4a4a3832c`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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