Office (OOXML) / .XLSX malware analysis — malicious · a6e7c2c51f30da04

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 3450d78b81780c191dc321806a7678a4 SHA-1: ff983e61c063cb8e457ee886041fa5d6f9ab8fec SHA-256: a6e7c2c51f30da041d26e544a7f63e95dd3cbe07acff3f20b4d3c16d67791707

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1566.002 Spearphishing Attachment

The file is an Excel document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro executes obfuscated commands via Wscript.Shell and cmd.exe. These commands appear to download and execute files from several suspicious URLs, including 'http://reumatismclinic.com/--/scCn3mbJRpwBvbrC/', 'https://shodmanjar.com/wp-admin/xEmK4Pd3N/', 'http://tubelocal.net/wp-admin/X4Xm4Mk/', 'https://pacifichomebroker.com/roderick/RRk/', and 'https://molinai-journal.com/rodericK/'. The script also attempts to create and execute a batch file at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\sduoixo.vbs', indicating a downloader or dropper functionality.

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` `67fd865a48128023e901cc8de24739faf9b6b0c7537809475b659a3ae8722a2f`	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.