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

Static analysis result for SHA-256 fd8ad8f256f063e3…

MALICIOUS

Office (OLE) / .XLS

3.04 MB Created: 2020-09-16 17:35:23
MD5: dece62de122b24c7f8ec42ea3ae7f150 SHA-1: 5647c99f482d6be1b3deecbc53c3b388e06b4828 SHA-256: fd8ad8f256f063e378e309575f9f98ab5e8c053ff3e343e4769031d54db733f9
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file contains a Workbook_Open VBA macro that utilizes Shell() and WScript.Shell to execute arbitrary code. This macro is designed to download and execute a secondary payload from the URL http://www.frez.co.uk. The presence of obfuscation techniques within the VBA code further indicates malicious intent.

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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
    URL http://www.frez.co.uk
  • 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.
    URL http://www.frez.co.uk
  • 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
5a42b1559a0abb3ce7f752bac9829c552899d59218698cb8169d86431f4ba709		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2229009 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 19 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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