Office (OLE) / .XLSX malware analysis — malicious · f414fb3f508d5f5a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e98d513ad99ae5ca200fa7af7ba40854 SHA-1: d792ed18a8962db0e15d5f6d6aee295db9018d7c SHA-256: f414fb3f508d5f5afd33d5a12a9cdaf4499e7fdde2ee48f0414b8d1d9f6c4d00

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The file contains a Workbook_Open VBA macro that utilizes Wscript.Shell to execute a batch file located at 'c:\programdata\jledshf.bat'. This batch file appears to be responsible for downloading and executing a second-stage payload, as indicated by the obfuscated command line arguments and the reconstructed URL list. The macro also attempts to create and run a VBScript file at 'c:\programdata\sduoixo.vbs'. The presence of Wscript.Shell, CreateObject calls, and the Workbook_Open auto-execution strongly suggest a malicious intent to download and run further malware.

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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