Office (OOXML) / .XLSM malware analysis — malicious · 3110ca3a3f271be4

MALICIOUS

Office (OOXML) / .XLSM

76.9 KB Created: 2020-06-17 09:25:59 UTC Authoring application: Microsoft Excel 16.0300

MD5: 8aab6782589a9d59d7ee752bce795420 SHA-1: a8cf50716a9c9587279200cfb37ebb208edcc6a8 SHA-256: 3110ca3a3f271be4e055a24fb49ae3f35646cea6f99d356ea6672a3f705dcbb5

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing VBA macros. Heuristics indicate the use of Shell() and CreateObject() calls, along with WScript.Shell, suggesting the macro attempts to execute commands or launch external processes. The presence of embedded VBA macros and the critical heuristic firings strongly indicate a malicious intent to run arbitrary code, likely for downloading and executing further malicious content.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `1b920a189baa8f7da53c366060684343429be06acafc9379d3e463b4ef6b2545`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1109 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `ac6f52e63c40efa0189bef9549d411339227ddb13257fbd7376833205f4d60e0`	vba-project	OOXML VBA project: xl/vbaProject.bin	15360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`emf_00.emf` `fecfe179ff2b97f835db12f78ddb379fa853a64b4aaa1cb5b029f82caacc6015`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	1976 bytes

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