Office (OLE) / .XLSX malware analysis — malicious · bf63aae9581da1a5

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 9508c7d61ad3e91e6b126750ea81d777 SHA-1: 33cf4278a8af7c6ab158d2bd2d46b58332dc5bc4 SHA-256: bf63aae9581da1a5e192afdac06fe1dad319516b4165ad1acbaa9de502aaabec

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a macro-enabled Excel file that contains a Workbook_Open macro. This macro uses CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject. It then proceeds to download and execute a batch file from 'http://goyaluaa.vmesha.in/0v6kcnky/CG/7Ffk6LN2Yxs2W/' and a VBScript from 'https://mars.srl/wp-admin/7Ffk6LN2Yxs2W/'. The batch file itself appears to be a downloader for further payloads, indicated by the long encoded string passed to powershell. The presence of Wscript.Shell and the encoded PowerShell command strongly suggest the execution of a second-stage payload. The file also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy.

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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