Office (OLE) / .XLSX malware analysis — malicious · 7f172884eb9b5965

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 617930428881f83894fd99ce9d1d5966 SHA-1: c295dc33bf74223e35ffa35a6fa4fa4131a5296a SHA-256: 7f172884eb9b59656d6ae29a43d729a94eee6377f18a7beacf5108126c916c95

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command and Shell T1547.001 Registry Run Keys / Startup Folder T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that utilizes CreateObject to instantiate a Windows Script Host shell. This shell is then used to execute a batch file located at 'c:\programdata\jledshf.bat'. The macro also attempts to execute a VBScript from 'c:\programdata\sduoixo.vbs'. The embedded script contains multiple URLs that are likely used to download and execute further stages of the payload. The presence of these elements and the ClamAV detection strongly indicate malicious intent.

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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