Office (OLE) / .XLSX malware analysis — malicious · 87fc7cd1b11e6cb4

MALICIOUS

Office (OLE) / .XLSX

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

MD5: be50823ab82dbd6b17f19e1f4455e19c SHA-1: cfd6b07f3e3233a30a095b1467103b8568f1f7d8 SHA-256: 87fc7cd1b11e6cb45e96943dad2c95c3b97df040dcd0df28ce40562103fd2cda

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 is a macro-enabled Excel file that triggers a Workbook_Open event. This event executes VBA code which utilizes CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject. The script then proceeds to download and execute a batch file from a URL, and also creates and executes a VBScript. The reconstructed URL for the batch file download is 'http://goyaluaa.vmeshaa.in/0v6kcny/'. The script also attempts to create a VBS file at 'c:\programdata\sduoixo.vbs' and execute it. The presence of Wscript.Shell and the execution of downloaded files strongly indicate a downloader or initial access payload.

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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