Office (OOXML) / .XLSM malware analysis — malicious · 3fa582c6429bfe7c

MALICIOUS

Office (OOXML) / .XLSM

13.1 KB Created: 2021-01-18 07:45:04 UTC Authoring application: Microsoft Excel 16.0300

MD5: d6db15ab7f42874b6bf76b6ea59be9a7 SHA-1: 5c2cd0f4131bf097493bda618d0bfbf1e7c24bf1 SHA-256: 3fa582c6429bfe7cb4932594db7265d2540256c36341194341b38511241bd3ec

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The presence of a Workbook_Open macro, coupled with critical firings for Shell() and WScript.Shell usage, indicates that this XLSM file is designed to automatically execute arbitrary code upon opening. The VBA macros likely download and execute a second-stage payload, leveraging the Windows command shell for execution.

Heuristics 7

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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `040e380938c7f234b9fa3d698b86ae8412f1aaecd2274cdf8d2727df3f584fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1483 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `8092f99712daf0a8490c38452c84ea65f278732edeb4373ad4c5e8e0260ad96c`	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). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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