Office (OLE) / .XLSX malware analysis — malicious · 388da9ac10e32f49

MALICIOUS

Office (OLE) / .XLSX

145.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: ee36a53e71db8e565a7715066cc8458c SHA-1: 212585a6cf2dcde34f060591c55692d5126f0844 SHA-256: 388da9ac10e32f49b74f0fc0ec4961e6078079ed700da4aa35c320c633eef1b4

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing a Workbook_Open VBA macro. This macro executes obfuscated VBScript code that attempts to download and execute payloads from multiple URLs. The VBScript code reconstructs the following URLs: 'http://reumatismlinica.com/./scCn3mbJRpsaKBbrC/', 'https://shodmanjar.com/wp-admin/xjEmK4Pd3N/', 'http://tubelocal.net/wp-admin/X4Xm4Mk/', 'https://pacifichomebroker.com/roderick/RRk/', and 'https://molina-journal.com/rodeirick/RRk/'. It also creates batch and VBScript files in 'c:\programdata\'. The VBA code also contains references to Wscript.Shell and CreateObject, indicating the use of scripting for execution.

Heuristics 7

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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