Office (OLE) / .XLSX malware analysis — malicious · 2c513801c217ac01

MALICIOUS

Office (OLE) / .XLSX

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

MD5: dc8023dd58acb0a0c02955427905b8ef SHA-1: 1a13c63d5c6bd19f29291382331e822a4eae3b37 SHA-256: 2c513801c217ac0159c12e7384ec1280f73e70db0a9b6b9fbe85f78f9198d15b

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1036.005 Match Legitimate Name or Location

The sample is a macro-enabled Excel file that triggers a Workbook_Open event. This event executes VBA code which utilizes Wscript.Shell and Scripting.FileSystemObject to create and execute a batch file ('c:\programdata\jledshf.bat') and a VBScript ('c:\programdata\sduoixo.vbs'). The VBScript appears to download a second-stage payload from a list of URLs, including 'http://goyaluaa.vmeshaa.in/0v6kcnky/CG/'. The VBA code also contains obfuscated strings that reconstruct a list of URLs and a command to execute a downloaded file.

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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