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

Static analysis result for SHA-256 a26cf1908d8e2e9a…

MALICIOUS

Office (OLE) / .XLS

1.46 MB Created: 2023-03-21 14:07:39 Authoring application: Microsoft Excel First seen: 2023-03-23
MD5: 518e41c69dec599380cccb991d047e16 SHA-1: 5b061c85b3c5be0079bdc830389f197c059e6f44 SHA-256: a26cf1908d8e2e9ab6e9b3fdf31d6cb5d58d7035374cd513b459a1541cc2fc79
262 Risk Score

Malware Insights

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

The Workbook_Open macro executes a Shell command to run a Windows Script File (WSF) located at C:\Users\Public\textfile.wsf. This WSF file is likely downloaded from the embedded URL http://37.139.128.83/black/1.vbs. The macro's primary function is to download and execute a second-stage payload.

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/black/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
24d4b75e34aa0b03388478fed82e337a5ed7bab8685ee2c386900f345066a0de		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1945 bytes

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