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

Static analysis result for SHA-256 4b384c51e14a22f7…

MALICIOUS

Office (OLE) / .DOCX

43.5 KB Created: 2019-07-23 07:51:00 Authoring application: Microsoft Office Word
MD5: 05a97bacb7fa655e1e7784fa677c5e85 SHA-1: dbc405d24917f93fdfb05e9c1539b9f765700f30 SHA-256: 4b384c51e14a22f754040ff00e6c2a2c36e19ab47b907a5751cd2bcd9eeac416
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218.005 System Binary Proxy Execution: Mshta T1105 Ingress Tool Transfer

The sample contains VBA macros that leverage the AutoOpen function to execute a Shell command. This command references mshta.exe, a LOLBAS utility, to download and execute a secondary payload from the URL https://evangelia.edu/image/bin/Rjboi0.hta. The use of AutoOpen and Shell() calls, along with the reference to mshta.exe, strongly indicates a malicious downloader.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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
  • 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 https://evangelia.edu/image/bin/Rjboi0.hta
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c4c83ecc0ee56b142dd7f1da7e6248cfbf02540049f6f7ed5f598b25b672432c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 413 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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