Office (OLE) / .XLSX malware analysis — malicious · f81a5a8c8ce21133

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 97ff15aad1266d95039099e928f32262 SHA-1: f44d74696aad13d96c40879f3e93e579f95cdbc0 SHA-256: f81a5a8c8ce21133421377ddb747b5c21efd8bdb2915d2ff08af98e33391d743

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for malware. The script uses CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject, indicating it intends to execute commands and manipulate files. The script attempts to download payloads from multiple URLs, including 'http://reumatismlinica.com/./scCnm3mbJRpsaKBbrC/', 'https://shodmanjar.com/wp-admin/xJE K4Pd3N/', 'http://tubelocal.net/wp-admin/X4Xm4Mk/', 'https://pacifichomebroker.com/roderick/RRk/', and 'https://molina-journal.com/rodeirick/'. It also attempts to write a batch file to 'c:\programdata\jledshf.bat' and a VBScript to 'c:\programdata\sduoixo.vbs', likely to establish persistence or further execute malicious actions.

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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