Office (OOXML) / .XLSX malware analysis — malicious · 4b9df940dd02ee03

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 911ae1b0ba9c21a141588c3834cfcc6b SHA-1: c4a3c4e87efcf96ff57b6678b45fc2806ba378bd SHA-256: 4b9df940dd02ee037398a851b70ed6edc794d630bb8f2de4774b526f231fc6ce

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The file is an Excel document containing a Workbook_Open macro that is designed to execute obfuscated commands. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://reumatismclinic.com/--/scCn3mbJRpwBvbrC/'. It also creates a batch file at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\sduoixo.vbs' for execution. The presence of the Workbook_Open macro and the obfuscated command execution strongly indicate a malicious intent to download and run further 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` `b1ac9569cf93369ba9247cb209f4f10a040426e1d1f668c19170c98af9cfeca4`	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.

Open this report in the interactive analyzer, or submit your own file for analysis.