Office (OLE) / .XLSX malware analysis — malicious · d6c4bb9f8911389b

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 5422980805398d97e1cd0090f9996d57 SHA-1: 26af5000194b4df1e514f0d92ce4e1131b69d896 SHA-256: d6c4bb9f8911389b494214d46d3c89ee6950aad031b9a64b2b9ee6f95d12868f

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 event, which is a common technique for executing malicious code upon opening the document. The script utilizes `CreateObject` to interact with `Wscript.Shell` and `Scripting.FileSystemObject`, indicating an intent to execute commands and manipulate files. The script attempts to download and execute a second-stage payload from a list of obfuscated URLs, including the reconstructed URL `http://goyaluaa.vmeshaa.in/0v6kcny/CG/`. It also creates batch and VBScript files in `C:\ProgramData` for execution. The presence of `Wscript.Shell` and the execution of external files strongly suggest 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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