Office (OOXML) / .XLSM malware analysis — malicious · f32072d7d581e1a8

MALICIOUS

Office (OOXML) / .XLSM

71.1 KB Created: 2020-05-20 11:02:45 UTC Authoring application: 16.0300

MD5: 4f8bef1a03978e1a3b783c3fb1ff1da6 SHA-1: 0378db0c3b8784df44f7f0f2ea5d48acf7d106f2 SHA-256: f32072d7d581e1a8d04c47b21dafadd58e3dccc3aa0188d7f95f6867944475e0

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an XLSM document containing VBA macros. Heuristics indicate the use of Shell() and WScript.Shell, suggesting the macros are designed to execute arbitrary commands. ClamAV detection as 'Xls.Dropper.Agent-7860003-0' further confirms its malicious nature. The primary function appears to be downloading and executing a secondary payload.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
ClamAV: Xls.Dropper.Agent-7860003-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7860003-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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` `3e1855b11b6b4859e5de8cc581033693966cee589edc7c11592731b1c8551411`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1338 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `62abed6a6e18e83af37e1650ae986f67f1b8e3992eec2e067d6b1864295e6d13`	vba-project	OOXML VBA project: xl/vbaProject.bin	17408 bytes
Detection ClamAV: Xls.Dropper.Agent-7860003-0 Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`emf_00.emf` `08455fcbd19420a76b832db844259f7f4d0d994071d9723815dea9332abc9b50`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	2804 bytes
`emf_01.emf` `3dc347a35e0db4ff1f94190b4e5af4f23db5ac24f1978b95ae0f0a933fae8b57`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	1976 bytes

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