Office (OLE) / .XLSX malware analysis — malicious · f4cd81f9a45d19db

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 6f73ff1ff3111f477ce7a4e6c012e026 SHA-1: ca33d70252f62835ad086134e9a95634871f1ce5 SHA-256: f4cd81f9a45d19db1736bc0426cd6aafd682a33c9809553f5f05cc825fc2bdaf

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The VBA macro contains obfuscated code that uses CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject. It attempts to download and execute a payload from a list of hardcoded URLs, including 'http://goyaluaa.vmeshaa.in/0v6kcny/CG/'. The script also writes a batch file to 'c:\programdata\jledshf.bat' and a VBScript to 'c:\programdata\sduoixo.vbs', which are likely used to execute the downloaded payload and establish persistence. The Workbook_Open event is triggered, initiating the malicious execution flow.

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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