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

Static analysis result for SHA-256 36ab0aba85ef3249…

MALICIOUS

Office (OLE) / .XLS

147.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: e9924fe30c31ef786180eadb257ace0c SHA-1: 37283abce53ab875d64f53514613b5f202fa775f SHA-256: 36ab0aba85ef32490da8beb5e29ce0ecd74d4b4d167a5cbf4f6d7b1ba74e746b
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The sample contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically. The script utilizes WScript.Shell and the Shell() function to download and execute a second-stage payload. The reconstructed URL for the payload download is USERPROFILE\fyf/nppghynkcodnkgeihgetigjpusqD0og5oskhks1111nuqpujuvusgehethg0npd/tbojeobsp. The presence of these elements strongly indicates a malicious downloader.

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
da4a31f08a84733d992a03482e691afa5f4e4f0639bfde828ec1084e6ad83de0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 49074 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 6 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.