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

Static analysis result for SHA-256 41adc266015fc564…

MALICIOUS

Office (OLE) / .XLS

134.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-01
MD5: cedbfa6b445127230d70eb867dacbb0b SHA-1: e70faa7a80736a0a1a6dcad98fe3140321dfa273 SHA-256: 41adc266015fc564f8b6a06524162fbe667e811c008145321f09748fa901b4cf
348 Risk Score

Malware Insights

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

This XLS file contains VBA macros that are automatically executed upon opening, as indicated by the Workbook_Open heuristic. The script utilizes WScript.Shell to execute commands, a common technique for downloading and running further malicious payloads. The obfuscated nature of the script and the presence of encoded blobs suggest a downloader or droppper functionality.

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
7d101a18a752608b1cac3a3e9d4cca4155038bc63f792913a33fbcba01972e9e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 46905 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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