Office (OOXML) / .XLSM malware analysis — malicious · 4ca7ca5b39a0ccd6

MALICIOUS

Office (OOXML) / .XLSM

139.4 KB Created: 2026-04-12 19:41:50 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2026-04-28

MD5: aaeda2da6be59cce92efbd199532adb0 SHA-1: e1c2e4759a79da756b2b5d3e1d2bcbc60fa574ce SHA-256: 4ca7ca5b39a0ccd6075520932154ac6acf5f5159871d764b24fadab35488b997

260 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLSM file contains a Workbook_Open macro that utilizes WScript.Shell to execute commands. The macro appears to be obfuscated, but the presence of Shell() and WScript.Shell usage strongly indicates it's designed to download and execute a second-stage payload. The specific payload and its destination are not discernible due to the obfuscation and truncation of the script.

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` `e7dafe5a7fbcc253d6dcfe7d1c1a3e6cbcedf13acff0bc0345d324fa35942c26`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `72c1b5db39bc34c9e8ebd7194a5d5ae25b1419f8e6058ab6fc4966063c4daba8`	vba-project	OOXML VBA project: xl/vbaProject.bin	25088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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