Office (OLE) / .XLSX malware analysis — malicious · ef35360362c41d80

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e318a24e65720e22f2068d845c687d92 SHA-1: 9f4ec4f278504e142a3d4e4926c9ed152cf5f6eb SHA-256: ef35360362c41d80cc574ccd2ffbbf03e768c8660254c39fbab25e7826f34853

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a macro-enabled Excel spreadsheet that triggers a Workbook_Open event. This event executes VBA code which uses CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject. The script attempts to download and execute a batch file from a hardcoded URL and also attempts to run a VBScript from a hardcoded path. The reconstructed URL for the download is "http://goyaluaat.vmesha.in/0v6kcny/CG/ ,https://mars.srl/wp-admin/7Ffk6LN2X s2W/,http://franmuler.es/mbx/8c5R B Jx6/,http://varafood.com/Ajax/cnM91G/,https://7jjcat.com/wp-content/t/,http://blog.centralhome.com/wpa-admin/". The script also attempts to create and execute a batch file at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\sduoixo.vbs'.

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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