Office (OLE) / .XLSX malware analysis — malicious · 3a7ae66a0816e838

MALICIOUS

Office (OLE) / .XLSX

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

MD5: f46e3779fc4299390e1847f6e34505a0 SHA-1: 3449df4c5c04aa0d613f463a129791929d429c83 SHA-256: 3a7ae66a0816e8385c9e941f60a2a5a5c38bf43a6a7a777e1860721e053d199c

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 sample is a macro-enabled Excel file that triggers a Workbook_Open event. This event executes a VBScript that attempts to download and execute a batch file from multiple URLs. The VBScript also attempts to create and execute a batch file named 'jledshf.bat' and a VBScript named 'sduoixo.vbs' in the 'c:\programdata' directory. The presence of 'Wscript.Shell' and 'Scripting.FileSystemObject' calls strongly indicates the execution of malicious scripts. The reconstructed URL 'http://reumatismclinic.com/./scCnm3mbJRprsaKBbrC/' is a key indicator of the download source.

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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