Office (OLE) / .XLSX malware analysis — malicious · fc9dbe13fcabbdee

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 04fbc657e61a96e52f46038d6571bb46 SHA-1: 1e00bbb600a175fe4d9f857424ab630567fe631d SHA-256: fc9dbe13fcabbdee88884f48d0ad35fdc9131ff6a0171f0995b81778a9f2bcef

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros that leverage Windows Script Host (Wscript.Shell) and the Scripting.FileSystemObject to execute commands. The Workbook_Open event is triggered, which attempts to create a batch file named 'jledshf.bat' and a VBScript file named 'sduoixo.vbs' in the 'C:\ProgramData' directory. The VBScript appears to be responsible for downloading and executing a second-stage payload from a hardcoded URL. The reconstructed URL is 'http://goyaluaa.vmeshaa.in/0v6kcnk/CG/'. The presence of Wscript.Shell and the execution of external 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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