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

Static analysis result for SHA-256 0da1163a00143901…

MALICIOUS

Office (OLE) / .DOC

51.5 KB Created: 2020-04-15 15:13:00 Authoring application: Microsoft Office Word
MD5: 6f1f70d8b7d62a7b8dce59ebf077f429 SHA-1: 50af2041b6b92b360ea8f55350e181cbf21dbd28 SHA-256: 0da1163a00143901f52c50317fe036c83efca8680d1e1d5702a0118a10b35d7d
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains VBA macros that leverage WScript.Shell and CreateObject to download a file from 'http://45.147.231.107/ldr.exe' and save it as 'c:\Atta5\ldr.exe'. The AutoOpen subroutine is triggered upon opening the document, initiating the download and execution process. This indicates a downloader functionality, likely to fetch and run a secondary malicious payload.

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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://45.147.231.107/ldr.exe
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
29ae2d58f053d02eb11a88dcf3a46ca2418f76caf063be60de86b62a36983d08		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2523 bytes

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