Office (OOXML) malware analysis — malicious · 57dd358bbc307c5f

MALICIOUS

Office (OOXML)

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

MD5: 53c42853e742cc8e1bb5d8d0abccaf8f SHA-1: 73fd405d1fdf24ca672a5301f61ab80ff4654ecb SHA-256: 57dd358bbc307c5fe9c9cdccaa148d5bd33daeb48ea8484eb981823cfd5c09a9

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 presence of a GetObject call further suggests dynamic execution. The VBA code appears to be obfuscated, likely to conceal its true intent of downloading and executing a second-stage payload. The primary technique observed is the use of Visual Basic for Application (VBA) to execute commands.

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` `d11de86a0ad75cf3b61f5f4f011e173bf95e0f32056d2e39402737b839b3ba40`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `0378949853019660814fdaec57c232b664205d0687737e6a74ed44e814d70bf2`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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