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

Static analysis result for SHA-256 9296f2fd6c9ff54b…

MALICIOUS

Office (OLE) / .XLS

188.5 KB Created: 2021-12-13 04:25:38 Authoring application: Microsoft Excel
MD5: c5cf749ca39b5a7581ed30688dcf9c84 SHA-1: 33961520e4875e7582d67b1036ffbb39983f9935 SHA-256: 9296f2fd6c9ff54bdc0239603238d89347ece6efd3fa75aa2b4baedac90c5f3a
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file contains VBA macros that are automatically executed upon opening, indicated by the Workbook_Open heuristic. The script utilizes WScript.Shell and CreateObject to download and execute a payload. Specifically, it constructs a path using the USERPROFILE environment variable and a concatenated string 'fyf/ddnn' to likely retrieve and run a secondary malicious file. The high number of critical and high severity heuristics related to VBA execution and shell calls supports this conclusion.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8e2f2989afd23e3ee066464c8a1f01170d20490b41d4f4eeca70715fba1c3cfb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 46371 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 6 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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