Office (OOXML) / .XLSM malware analysis — malicious · f66fe29569be1771

MALICIOUS

Office (OOXML) / .XLSM

142.2 KB Created: 2021-02-10 00:37:58 UTC Authoring application: Microsoft Excel 15.0300

MD5: 7a676f47c83d58544756e68911f7e9f3 SHA-1: 77d8c2bf11bad21aa152d58a0b684dc534f3ed90 SHA-256: f66fe29569be17717a1ac2e7e6d1990a78256824e9badbb93b18c6c7cd1b5bee

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 or scripts upon opening the document. The presence of these critical heuristics strongly suggests the file is a macro-based downloader or dropper.

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` `5ef99ba8792ce56f7e22814b69ef348706b5929cf3a4ea3e7338622f0d6ef32f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2067 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 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` `1f85e5c87ab6d88627240f9c1c191373ab4cceaeb4330083b730158353204e41`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 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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