Office (OOXML) / .XLSX malware analysis — malicious · e317224b8ee1f8d6

MALICIOUS

Office (OOXML) / .XLSX

18.5 KB Created: 2021-05-11 15:01:27 UTC Authoring application: Microsoft Excel 16.0300

MD5: afe3ca4e63cfd0e68d58a33396b6898e SHA-1: dc0bcefe3c26ba3f60f143fa9b98475f19c6a662 SHA-256: e317224b8ee1f8d62eb12ee2e3ad661846b2989b9fdfcee755470ff732ba9be1

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The XLSX file contains VBA macros, specifically triggering an Auto_Close macro. This macro utilizes WScript.Shell and CreateObject to execute PowerShell commands. The primary intent appears to be downloading and executing a second-stage payload, indicated by the critical heuristic firings for Shell() and PowerShell usage.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Suspicious extracted artifact medium 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7075b5e2be41ad21d8240bfa2638abd8529413edbe80f5ae9dd4d4f50484e919`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).
`vbaProject_00.bin` `81290a884c3b9fff5135e3c6507834c4b49f7a4f0c173a3fc3233b4ac5dbf773`	vba-project	OOXML VBA project: xl/vbaProject.bin	25600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).

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