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

Static analysis result for SHA-256 c7d5012d66ffa3b8…

MALICIOUS

Office (OLE) / .XLS

437.5 KB Authoring application: Microsoft Excel
MD5: 8fbc134cd9045babf12a55a5dadcf5fd SHA-1: 665f44b2651d10316f9fc686ad7c3754730d0a12 SHA-256: c7d5012d66ffa3b87cda74fcd2190bad0db077ddad489b007571f3a004928924
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLS file contains a critical OLE_VBA_SHELL firing indicating a Shell() call within its VBA macros. The presence of an Auto_Open macro (OLE_VBA_AUTO) and a high-severity SC_STR_SHELLEXEC heuristic further suggests that the macro is designed to execute arbitrary commands upon opening. The extracted artifact 'macros.bas' is the source of these macros. The script likely downloads and executes a second-stage payload, but the exact command and payload are not discernible from the provided static analysis.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0dc5b69bff5ac2b26c9e470780c8e5b6c837f403aec472e594d01a3714df1952		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 814952 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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