Office (OOXML) / .XLSX malware analysis — malicious · 80b1f03b5d1aee8b

MALICIOUS

Office (OOXML) / .XLSX

74.7 KB Created: 2020-12-28 23:32:28 UTC Authoring application: Microsoft Excel 2.6

MD5: 9823b04a117533b80de9028e530a9b03 SHA-1: 02417bd071eda327457eeceaf7b3943e96bb1d41 SHA-256: 80b1f03b5d1aee8b7b9b6ba50c3645bf6c48916c3ef46c52891253e0fe0c3d76

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 Signed Binary Proxy Execution T1059.001 PowerShell

The sample is an OOXML file containing a VBA macro with an Auto_Open subroutine. This macro utilizes WScript.Shell and CreateObject to execute commands, including PowerShell, and references a LOLBin. The document body attempts to socially engineer the user into enabling macros by presenting a fake error message. The primary intent appears to be executing arbitrary commands via the VBA macro, likely to download and run a second-stage payload.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ec6f218124a19312c012420cd58675d1816f5593af88eb4a5d85ecc7d9ff2dcc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `fe9fbbbe5fa2cd5d5b0c6651eeed3e57664f076f02a859453f708fa4f99911dd`	vba-project	OOXML VBA project: xl/vbaProject.bin	18944 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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