Office (OOXML) / .XLSX malware analysis — malicious · fc9e7e59af73a9be

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 7b3a48a8f43eb3b7db541dde6da9d4df SHA-1: ccff05fd441d9f469c99c53789eda826e3d74e44 SHA-256: fc9e7e59af73a9be5cab52cbd220f3e81b3903bbd68c36600b80a1c4ba7b140a

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel document containing a Workbook_Open VBA macro. This macro is designed to execute a batch file located at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\sduoixo.vbs'. The script also attempts to download and execute a payload from a concatenated URL, which reconstructs to 'http://reumatismclinic.com/--/scCn3mbJRp8bRC/http://shodmanjar.com/wp-admin/xjEmK4Pd3N/http://tubelocal.net/wp-admin/X4Xm4Mk/https://pacifichomebroker.com/roderick/RRk/https://molinai-journal.com/roderick/Rk/'. The ClamAV detection further confirms the malicious nature of the file.

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` `2cdb85558f42e353ce84a6457f59d1d20b282ed2cc1f951c4d2a90c30d5db83d`	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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