Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 e95ba35b4f674a52…

MALICIOUS

Office (OLE) / .XLS

1.46 MB Created: 2023-03-21 14:07:39 Authoring application: Microsoft Excel First seen: 2023-03-24
MD5: 2c27d6fe88c0546e5de604ce50e3a83c SHA-1: 3a68164d3171b661f4ed5dafbcd5e73812fd42fc SHA-256: e95ba35b4f674a525cbe1a09935db84ea766bad5257486c5ace7dc892e7e9baa
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The Excel file contains a Workbook_Open macro that writes a WSF script to disk and then executes it using wscript. The WSF script is designed to download and execute a second-stage payload from the URL http://37.139.128.83/kelviiin/1.vbs. The presence of Shell() calls and WScript references strongly indicates a downloader or droppper functionality.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Trojan.Generic-9994592-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Generic-9994592-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://37.139.128.83/kelviiin/1.vbs
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
    • http://schemas.microsoft.com/DataMashup

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fc98b2ec3d3d3fb64eab2ec23cc701973ef12ad40e65eed807ff1bedb729763a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1945 bytes

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