Office (OOXML) / .XLSX malware analysis — malicious · 7c8d130b8d3f01e0

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b2ec2d2dc5b96aa715ca7e2cf452e847 SHA-1: 029f3b3da966b8a032d2356064d827717643060a SHA-256: 7c8d130b8d3f01e0440933a74b8c9de813a4ce8c91b653b84caea3c849d6bec6

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 with a high-confidence detection for VBA macros, specifically a Workbook_Open macro. The macro executes obfuscated commands via Wscript.Shell, including the creation of a batch file (jledshf.bat) and a VBScript file (sduoixo.vbs) in the programdata directory. The script also attempts to download payloads from multiple URLs, including 'http://reumatismclinic.com/--/scCnm3mbJRpwBvbrC/'. This indicates a downloader or droppper 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` `f788ea8e4aafaa1b5fd0b7c6384d18581a056aea28fe034ade28153741964109`	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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