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

Static analysis result for SHA-256 44d3120649c506e3…

MALICIOUS

Office (OLE) / .XLS

2.52 MB Created: 2020-09-16 17:35:23 First seen: 2022-10-17
MD5: f8d867792101f82d1f7b18b915d9a557 SHA-1: 09a13a6ff3d569e67f65dc530525f7cfc5493a1f SHA-256: 44d3120649c506e34982091e895f48c723dbfb4c9b40f4c36f24953748f6b81b
442 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: Malicious File

The Workbook_Open macro is obfuscated and uses CreateObject and Shell() calls via WScript.Shell to execute commands. This indicates the primary purpose is to download and run a secondary payload from the embedded URL http://www.frez.co.uk. The presence of WScript.Shell and Shell() calls strongly suggests execution of arbitrary code.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
  • 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://www.frez.co.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fd02c07e0aa3f2aa539e22fb59201548804a2d997dc6f8f426df513024d65441		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2151545 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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