Office (OLE) / .XLSX malware analysis — malicious · db8b7b8daa472768

MALICIOUS

Office (OLE) / .XLSX

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

MD5: c4053af259e5f6a5a087cf9f019e1dab SHA-1: da7438099869adb4b6dd4a5bf5aa79bbc3e61d82 SHA-256: db8b7b8daa472768a0d0ea0efdd2ad9061067c9b9fbf1c7707e55ff3ebd4f989

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros that execute upon opening the workbook. These macros leverage Wscript.Shell and Scripting.FileSystemObject to create and execute batch and VBScript files. The VBScript file, 'sduoixo.vbs', is constructed from concatenated strings and appears to download payloads from multiple URLs, including 'http://goyaluaat.vmesha.in/0v6kcny/CG/7Ffk6LN2X s2W/'. The batch file 'jledshf.bat' is also created and executed. The presence of Wscript.Shell and the dynamic execution of scripts indicate a downloader or droppper functionality.

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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