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

Static analysis result for SHA-256 41cb3f4a91d2b829…

MALICIOUS

Office (OLE) / .XLS

141.5 KB Created: 2020-08-01 09:22:57 Authoring application: Microsoft Excel
MD5: 1467786f539f1cac3347f463ae0f553c SHA-1: c28790b2195e59e72a9918e3ff48de4d3e5bade0 SHA-256: 41cb3f4a91d2b82931aa1acbe1b2d6a85df5c2f9d590ea205c80046fbb2aac2b
440 Risk Score

Malware Insights

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

This XLS file contains VBA macros, including Workbook_Open and Auto_Open, which are designed to execute code automatically. The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell to run commands. The CLAMAV_DETECTION heuristic further confirms its malicious nature, identifying it as Xls.Macro.Obfuscation-9804250-0. The primary attack vector appears to be macro execution leading to arbitrary command execution.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1edac2ebed96a95b0c17d37a4f2f1c500775dbed9316516ae00c87f8683b975a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 17017 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 69 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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