Office (OLE) / .XLSX malware analysis — malicious · f1f0926772b7c30b

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 40dbb40c1ca1d107c2a700dee7483f62 SHA-1: 53374787f2af113c4a0ae32226cb8032ee8c6abe SHA-256: f1f0926772b7c30b8122fd0a7488040a2a77a40bd1e59d3da7769c92e45792d4

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains a Workbook_Open VBA macro that executes Windows Script Host commands. The macro attempts to create and execute a batch file named 'jledshf.bat' and a VBScript file named 'sduoixo.vbs' in the 'C:\programdata' directory. The script also contains obfuscated URLs that are likely used to download additional malicious content. The presence of CreateObject and Wscript.Shell firings, along with the Workbook_Open auto-execution, strongly indicates a downloader or dropper 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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