Office (OOXML) / .XLSM malware analysis — malicious · 20ff54eb54bdb826

MALICIOUS

Office (OOXML) / .XLSM

52.8 KB Created: 2020-06-10 10:17:11 UTC Authoring application: Microsoft Excel 16.0300

MD5: 9a7eb000cfd52003caf97e666a49459d SHA-1: 9437e16fc3bc71a67fc8d3abdc35e94806e5085d SHA-256: 20ff54eb54bdb826df1b416a8c353a49723d9a36069aeaf516d2043bc41a6554

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218.011 Signed Binary Proxy Execution: Rundll32

The sample is an XLSM file containing VBA macros. Heuristics indicate the use of Shell() and WScript.Shell, suggesting the execution of arbitrary commands. The presence of extracted files like macros.bas further supports this. The VBA macros likely download and execute a second-stage payload, a common technique for initial access or further system compromise. No specific family could be identified.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Suspicious extracted artifact medium 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a770ad8214d45a2307cffe40b6a241efeba85ebe106a09b9e6affc7d015310f0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `aba5d7d03e9e7c0076b338ab3a5c76d538052033133a214b8a6c3959d38dc945`	vba-project	OOXML VBA project: xl/vbaProject.bin	17408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`emf_00.emf` `5b66e7534e104135fa70c6b280638c62a133c84f0339a0a2afc5e6b70f87eb44`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	2748 bytes
`emf_01.emf` `9b73180d3d78b176168c1ec139b787b8d7f583adab2e32295cb843135f15a303`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	2352 bytes

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