Office (OOXML) / .XLSM malware analysis — malicious · 8c30635fa8cc452d

MALICIOUS

Office (OOXML) / .XLSM

143.9 KB Created: 2021-01-18 00:53:55 UTC Authoring application: Microsoft Excel 16.0300

MD5: e815ac129a6c26ba513742fe3e834835 SHA-1: 0fff500ea03bbac5d9b439cd48ba386739eec351 SHA-256: 8c30635fa8cc452d445c345ac855339c23b3845dfe9d3cc91550d17771459a0e

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML file contains VBA macros, specifically a Workbook_Open macro that is designed to execute automatically. The macros utilize WScript.Shell and CreateObject to run commands, likely to download and execute a second-stage payload. The presence of these elements strongly indicates a malicious macro-based document.

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` `b27389b97cc80dbb3f92a03ab7e9dce4a2cd9b6fb478d3bc3a9f800fa6e384db`	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` `78340988aec29ca56eab9d00dba347ad9fe898d9400368c361a8f48e6d7fff48`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 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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