Office (OLE) / .XLSX malware analysis — malicious · 34b9f4bf0fc2023d

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 309fe10df4bed875728be50c63f39021 SHA-1: 07d271466bc5b7b3e6c11e29f9d29a95cc30ea35 SHA-256: 34b9f4bf0fc2023d1af0930b7078a62137451b65e575f03124ae6039fbc6a3d6

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro is triggered upon opening, which uses CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject. It then proceeds to execute commands from the document body, including the creation and execution of batch and VBScript files located in 'c:\programdata\'. The script also contains obfuscated URLs that are likely used to download and execute second-stage payloads. The presence of multiple suspicious URLs and the execution of external scripts indicate a downloader or droppper functionality.

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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