Office (OOXML) / .XLSX malware analysis — malicious · 4707611b50eacb37

MALICIOUS

Office (OOXML) / .XLSX

143.1 KB Created: 2020-11-16 05:28:30 UTC Authoring application: Microsoft Excel 16.0300

MD5: 85ec7847c52d4394c50c64f97b867729 SHA-1: f3095eee70952fe56b3f5ef295df92ae957800d7 SHA-256: 4707611b50eacb37f9fd897711178125d4b1173c92a8f3b5e39baf602cfacd19

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the macro is designed to automatically execute a command upon opening the document. The presence of these elements strongly suggests a malicious intent to run arbitrary code, likely to download and execute a secondary payload.

Heuristics 4

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `edb56740b359681ed8cc7b721fd573f456322bc88430b89aef001b00f957fba3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1692 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `563f1b4c6c22e3583dec32745bce8e7989a3dc132cc09524fe1729a8f98fda9a`	vba-project	OOXML VBA project: xl/vbaProject.bin	13824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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