Office (OLE) / .XLSX malware analysis — malicious · de2fff247433d837

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 7f1f5c003a0d22c88292cc2f9e2a6d25 SHA-1: c5b628d4eea80cb33f99fcab6b910ac9c792d7c6 SHA-256: de2fff247433d837930c3b71fd347fc3c8124153ef4d5120d87ff7adfb688e4a

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file contains VBA macros that trigger on Workbook_Open, indicative of malicious intent. The script attempts to execute a batch file (`c:\programdata\jledshf.bat`) and a VBScript (`c:\programdata\sduoixo.vbs`) using `wscript.shell`. The VBScript appears to be a downloader, reconstructing a list of URLs from concatenated strings, such as `http://goyaluaa.vmeshaa.in/0v6kcnk/CG/`, which it likely uses to fetch and execute additional stages. The presence of `CreateObject` and `wscript.shell` firings further supports this execution flow.

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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