Office (OOXML) / .XLSX malware analysis — malicious · 397c99255dcafaf0

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d4e8959d4bee00b3eeb3facff1664059 SHA-1: fe4ba62ec511b9f59fac1dbf452b230387a433f0 SHA-256: 397c99255dcafaf098d3993d821d13f6116dd12d05cd098b21dfbdd5b39db28c

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.002 Spearphishing Attachment

The sample is an Excel document containing a Workbook_Open macro, which is a common technique for initiating malicious activity upon opening. The macro attempts to execute a batch file (`c:\programdata\jledshf.bat`) and a VBScript (`c:\programdata\sduoixo.vbs`). The VBScript is responsible for downloading and executing payloads from multiple URLs, including `http://reumatismclinic.com/- /scCn3mbiJRpsBaKBrc/` and `https://shodmanjar.com/wp-admin/xjEmK4Pd3N/`. The presence of these elements and the ClamAV detection strongly indicate a malicious intent to download and execute further stages of malware.

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` `0146d4cc299d477e16fb21d3d997b1c630f114577a3969b4decd8043acf42714`	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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