Office (OLE) / .XLSX malware analysis — malicious · c8ce1861a243102e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 887d469735ae740c2ea2e45723fe3e6f SHA-1: 2c4be90c972dc91a3173ebec0717dcb10dea8ee5 SHA-256: c8ce1861a243102e76898f3adf145d2a8d4f7b8df6f2786415038137fa79de5b

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically when the workbook is opened. The script utilizes 'CreateObject' to instantiate 'Wscript.Shell' and 'Scripting.FileSystemObject', indicating an intent to run external commands and manipulate files. It constructs a command line that includes a base64 encoded string, which likely decodes to a URL for downloading a second-stage payload. The reconstructed URL is 'http://goyaluaa.vmeshaa.in/0v6kcnky/CG/'. The script also creates batch and VBScript files in 'c:\programdata\'.

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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