Office (OOXML) / .XLSX malware analysis — malicious · bab4f0482e2bc92c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 507603206fa71cbb7e1cc3c8fb242fd3 SHA-1: 7c5f729b8100c749bfba4f1e82107db3142bd63c SHA-256: bab4f0482e2bc92cf0252c7787fc9037a74c5504448c44b3805a87016742c661

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSX file containing a Workbook_Open VBA macro, flagged by ClamAV as Doc.Malware.Valyria-10004384-0. The macro utilizes Wscript.Shell to execute a batch file and a VBScript, both located in C:\ProgramData. The script attempts to download payloads from multiple URLs, including 'http://reumatismclinic.com/ -/scCnm3mbJRpwBsKBbrC/', 'https://shodmanjar.com/wp-admin/xjEmK4Pd3N/', 'http://tubelocal.net/wp-admin/X4Xm4Mqk/', 'https://pacifichomebroker.com/roderick/RRk/', and 'https://molina-journal.com/roderic/RRk/'. 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` `dd034a89f980b0842a21c569ab2034913fb283d80da32cea77ccf285b99b89c4`	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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