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

Static analysis result for SHA-256 4ba4ad1b7bf7d103…

MALICIOUS

Office (OLE) / .XLS

271.0 KB Created: 2021-07-24 09:17:42 Authoring application: Microsoft Excel
MD5: 9a8afb4f1f606a459496f03b20acb455 SHA-1: 54e00a1fbeeff86d04caa94254a620f1e81e5959 SHA-256: 4ba4ad1b7bf7d103673b4bbf14cb7656647ee7ee655c3722e98c643f475d7062
348 Risk Score

Malware Insights

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

The Excel file contains a Workbook_Open macro that utilizes WScript.Shell to execute arbitrary commands. This indicates a likely attempt to download and run a second-stage payload. The obfuscated VBA code, while not fully decipherable, strongly suggests malicious intent. The presence of WScript.Shell and Shell() calls are critical indicators of this behavior.

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
d326c14a85a63988fe31e296aa728582246e3d49b86c91b4ae6e3f7fda28350f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 55317 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 10 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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