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

Static analysis result for SHA-256 93dce7b0578b6e41…

MALICIOUS

Office (OLE) / .XLS

425.5 KB Created: 2021-12-13 04:25:38 Authoring application: Microsoft Excel
MD5: 24d49a844f73f22c176336a4c9cdf823 SHA-1: 24e904028e40d1cca0ff3ab10bfa07ff0135aec7 SHA-256: 93dce7b0578b6e41850213bc7fd7aaa67a9a5ad5c0a67bdf43da75c132b462c4
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell to execute commands. The Workbook_Open macro (OLE_VBA_PCODE_AUTOEXEC_EXEC) is designed to run automatically when the workbook is opened. The script reconstructs a path using the USERPROFILE environment variable and a concatenated string, likely to download and execute a second-stage payload. The reconstructed path is USERPROFILE\fyf/ddnn.

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
3a2d4c7f4695b5728c597775dc3c162c2b56dde7e1f7d9fad2840837a425c240		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 55121 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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