Office (OOXML) / .XLSM malware analysis — malicious · 8a977b9322bc90f9

MALICIOUS

Office (OOXML) / .XLSM

119.1 KB Created: 2021-01-29 01:28:53 UTC Authoring application: Microsoft Excel 15.0300

MD5: 56561114904f9c9ba0ed89ab858e5c11 SHA-1: fb55f02486b1e0b0481bc0a55b5cf501e45357e1 SHA-256: 8a977b9322bc90f9ed6ed3274f73cc8d46ee36d50cff3ed6a9816cb4bbfe6794

260 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, specifically a Workbook_Open macro that utilizes WScript.Shell and the Shell() function. This indicates the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. The presence of these critical heuristics strongly suggests a macro-based malware delivery mechanism.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `94ea1b45ec08ab9160ca0b5ed89b3da1f2073854e28971ed14f2f776ce4bea54`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2133 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `849c085c8f78da222e15fa2b7a6fd08071b7d1863da4ed339b797e614b15a393`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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