Office (OOXML) / .XLSX malware analysis — malicious · a295acadd9315a1d

MALICIOUS

Office (OOXML) / .XLSX

16.6 KB Created: 2021-04-27 12:22:41 UTC Authoring application: Microsoft Excel 15.0300

MD5: 394b7f2d28e0b439323f9c38f1f84274 SHA-1: ac582b228ea8fb7a14f24265585c937c83a864d4 SHA-256: a295acadd9315a1dbdd0b1a96b84844181ac8a462a3b42be3db8e7e04d03956c

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is an OOXML Excel document containing a Workbook_Open VBA macro, indicating an attempt to automatically execute malicious code upon opening. The presence of CreateObject calls and the extraction of VBA macros suggest the script is designed to download and execute a second-stage payload. No specific family could be identified, but the technique is common for initial access.

Heuristics 4

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` `aed20bdd31503f6098294a2f156a243b15c725784217deea8019b18bbd128e0a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5466 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` `bd065248484c03baac5a4f5083fef43751a3583ef61687ee9695a6aa636a85de`	vba-project	OOXML VBA project: xl/vbaProject.bin	22528 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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