Office (OOXML) / .XLSX malware analysis — malicious · 9ca23455dc4fb236

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 32150e6f34eae4d92add66d182c98177 SHA-1: 9d7f4990ed984f58608bc40d78d990188a56e3c2 SHA-256: 9ca23455dc4fb2369781419924a07119a1801a0d403d35ceb4c4e61050412cea

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059.001 PowerShell

The file is an Excel document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro uses CreateObject to interact with the system, and the embedded script attempts to download and execute payloads from several URLs. The script reconstructs the following URLs: 'http://reumatismclinic.com/./scCn3mbJRp8bKbrC/', 'https://shodhmanjar.com/wp-admin/xJE4P3d3N/', 'http://tubelocal.net/wp-admin/X4Xm4Mk/', 'https://pacifichomebrok.com/roderick/RRk/', and 'https://molinai-journal.com/roderic/RRk/'. It also attempts to create and execute batch and VBScript files from the 'c:\programdata\' directory, specifically 'c:\programdata\jledshf.bat' and 'c:\programdata\sduoixo.vbs'. The ClamAV detection further confirms its malicious nature.

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` `d6786d5c7cb147c707f4065407015ef5ba509b44f4ee84383824495b3a9862eb`	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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