Office (OLE) / .XLSX malware analysis — malicious · 21586aedea9577b5

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 19a9bab0b7479fd2524af80c8a4566d4 SHA-1: 83923ea1a0596e9e864dc2ae9431acd7e1117544 SHA-256: 21586aedea9577b543957c424b0d376cfcd132af442ea5ee93113744a123c952

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a malicious Excel file containing a Workbook_Open VBA macro. This macro utilizes CreateObject to interact with Wscript.Shell and Scripting.FileSystemObject, indicating an attempt to execute arbitrary commands and manipulate files. The script reconstructs a command line that includes a base64 encoded string, which likely decodes to a URL for downloading a second-stage payload. The presence of `c:\programdata\jledshf.bat` and `c:\programdata\sduoixo.vbs` further suggests the creation of malicious files on the system. The reconstructed URL `http://goyaluaat.vmesha.in/0v6kcnky/CG/7Ffk6LN2X s2W/` is a primary 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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