Office (OLE) / .XLSX malware analysis — malicious · 9b8284eb8b606edf

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 2fb5021302f54a82fd9c3119d5127063 SHA-1: a9a681a81181c8a3b6665b1fbb95ce7054d0407f SHA-256: 9b8284eb8b606edfb7d80d462081772daf5d36a5c9f41b297a7110204302d489

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1036.005 Match Legitimate Name or Location

The file is a macro-enabled Excel spreadsheet containing a Workbook_Open macro that uses CreateObject to instantiate Wscript.Shell. This script then proceeds to download and execute a batch file from a hardcoded URL. The script also attempts to create a VBS file and execute it. The presence of Wscript.Shell and the download/execution pattern strongly suggest a downloader or initial access stage of a malware infection. The reconstructed URL for the batch file download is http://reumatismclinic.com/./scCnm3mbJRpsaBKbRC/, which is a primary IOC.

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.

Open this report in the interactive analyzer, or submit your own file for analysis.