Office (OOXML) malware analysis — malicious · 44cde302c2979025

MALICIOUS

Office (OOXML)

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

MD5: ae2ee450d1510e6b3cb1b555ea72f46f SHA-1: 4c8b758fb30d272ec38070253d377ec837ebb4fc SHA-256: 44cde302c2979025bb86adc808d140e0a2996633bb38351f4f8b8348e41b1dde

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 file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call suggests an attempt to load and execute external code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload. This points to a macro-based 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` `16ee38d6d1a587c67b1000912a360170fd6d5d9c0b6801aee67b408059d5b837`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `f8887f4fdc390543a8123d0577269b3878af6f174fba3848a407dfd5802f2d59`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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