Office (OOXML) / .XLSX malware analysis — malicious · 34b13339dad446f5

MALICIOUS

Office (OOXML) / .XLSX

111.6 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: d553e1c4f586123a30bda935d7015b42 SHA-1: 7641dc265df58b1b9f8c6b50ace6ce8368e1862f SHA-256: 34b13339dad446f5def5d75dd4740c8d84ebb6d80d8ab0c9cabd6709fe7655af

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a macro-enabled Excel document detected by ClamAV as Doc.Malware.Valyria-10004384-0. The Workbook_Open macro and CreateObject heuristic indicate that malicious VBA code is executed upon opening the document. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://reumatismclinic.com/--/scCnm3mbJRpsaKBbrC/', and saves it as 'c:\programdata\jledshf.bat'. It also attempts to execute a VBScript from 'c:\programdata\sduoixo.vbs'.

Heuristics 6

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7821 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` `5fa0bd9d92c7ffc25dd5761039217f06339d3a76cf4aa16402b6cc9efa740deb`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 bytes
Detection ClamAV: Doc.Malware.Valyria-10004384-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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