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

Static analysis result for SHA-256 a907be84fd31c3e4…

MALICIOUS

Office (OLE) / .XLS

176.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: f2ee53e7d74a14975f8a6b9cd728a156 SHA-1: a6f6704592671ecd3aa231f5253174d350262795 SHA-256: a907be84fd31c3e486573199a29ebc2624310b18a4872ffe5ab9f45d74af58ec
350 Risk Score

Malware Insights

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

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell within VBA macros. The Workbook_Open macro is present and configured to execute. The script attempts to construct a path using Environ$("USERPROFILE") and a concatenated string, resulting in the IOC "USERPROFILE\fyf/ddnn". This suggests the macro is designed to download and execute a second-stage payload from a location determined by the script.

Heuristics 10

  • 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)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2dac5714e9f565c206a7d4e39bbf0c88671fb8191d3842d2f40c3b7607b97b90		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 46557 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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