Office (OOXML) / .XLSX malware analysis — malicious · 49bffe4284cb0094

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 677331bb34f1836875bd88d8c1a05b6a SHA-1: 61cd4bd0e90c8e3379b4f67f7ece24d458292847 SHA-256: 49bffe4284cb00940c8a03e5fe56b14276158a4e942e99fb55e280a155f5cb84

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel document containing a Workbook_Open macro, identified by ClamAV as Doc.Malware.Valyria-10004384-0. The macro is designed to download and execute a second-stage payload. Specifically, it uses Wscript.Shell to execute a batch file (`c:\programdata\jledshf.bat`) and a VBScript (`c:\programdata\sduoixo.vbs`). The VBScript is responsible for downloading additional payloads from several hardcoded URLs, including `http://reumatismclinic.com/--/scCn3mbJRpwBsKBbrC/` and `https://shodmanjar.com/wp-admin/xjEmK4Pd3N/`, and saving them to `c:\programdata\jledshf.bat` and `c:\programdata\sduoixo.vbs` respectively. The obfuscated nature of the DOC BODY content suggests an attempt to hide the malicious commands.

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` `25a99116911c1cb6a0ff7160ed84e9685f478dda5bb7478cfdf491fa32d553bc`	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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