Office (OLE) / .XLSX malware analysis — malicious · b84fadcb251a016b

MALICIOUS

Office (OLE) / .XLSX

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

MD5: cfcef5a366900e245a6a93ae37380ed2 SHA-1: 6171feac46802d5c0a24685e84dcdb872f1892ca SHA-256: b84fadcb251a016bed24c55cc2f8242af3fcdb0a9843a31d455f0f2509d6e579

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically when the file is opened. The macro utilizes 'CreateObject' to instantiate 'Wscript.Shell' and 'Scripting.FileSystemObject', indicating an intent to run external commands or scripts. The reconstructed command line arguments within the VBA script, such as 'hell -e', and the presence of paths like 'c:\programdata\jledshf.bat' and 'c:\programdata\sduoixo.vbs', suggest the macro is responsible for downloading and executing a second-stage payload. The script also attempts to download from multiple URLs, including 'http://goyaluaat.vmeshaa.in/0v6kcnky/CG/', which is a high-priority IOC.

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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