Office (OLE) / .XLSX malware analysis — malicious · d2eeea2c52d3c0ed

MALICIOUS

Office (OLE) / .XLSX

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

MD5: ddd821b9f29e4bf028dfc944d5c03bd5 SHA-1: 959ed8fb57511fbd4f921b3c52c719883e781429 SHA-256: d2eeea2c52d3c0ed9ae526da9227458afc3851d747c6e0139c3c3f667ed10b1b

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file contains VBA macros that are automatically executed upon opening the workbook, as indicated by the Workbook_Open heuristic. The script utilizes `CreateObject` to instantiate `Wscript.Shell` and `Scripting.FileSystemObject`, which are then used to download and execute files from various URLs. Specifically, the script attempts to execute a batch file located at `c:\programdata\jledshf.bat` and a VBScript at `c:\programdata\sduoixo.vbs`. The reconstructed URL `http://goyaluaa.vmeshaa.in/0v6kcny/CG/` is a strong indicator of a downloader payload. The presence of `Wscript.Shell` and the execution of external scripts point towards a multi-stage attack.

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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