Office (OLE) / .XLSX malware analysis — malicious · 473a5a0e21ba0463

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 32017ded9f88f6cae3b1333a22ed3557 SHA-1: 4a95ac27c276647cd8cad07f5ec56b7a9fab596a SHA-256: 473a5a0e21ba04632a0bfc3c72ee2afcbb86a4469a89a7918c371c3b26df2402

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The sample contains a Workbook_Open VBA macro that executes Windows Script Host commands. The macro attempts to download and execute a batch file from a constructed URL. The script also attempts to create a VBScript file and execute it. The reconstructed URL for the batch file download is 'http://goyaluaat.vmesha.in/0v6kcny/CG/'. The VBScript file is named 'sduoixo.vbs' and is placed in 'c:\programdata\'. The macro also contains a long, obfuscated string that appears to be a list of URLs, likely for downloading additional payloads.

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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