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

Static analysis result for SHA-256 fea28fbd5a5cd519…

MALICIOUS

Office (OLE) / .DOC

43.5 KB Created: 2016-03-23 20:41:00 Authoring application: Microsoft Office Word
MD5: 61049048403f552be9a6d6528521d342 SHA-1: 50fcf304bc9c80c1fbec9f515e2435fae3d57de1 SHA-256: fea28fbd5a5cd51916cad42b0cbeadb80c5962210753d37573897e6d70b51815
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, specifically a Document_Open macro that is automatically executed upon opening the document. This macro utilizes CreateObject to likely download and execute a second-stage payload from the embedded URL http://web-intra.fhc-inc.org/live/essentials.php. The obfuscated nature of the script, with its loops and string concatenations, suggests an attempt to evade detection.

Heuristics 7

  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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://web-intra.fhc-inc.org/live/essentials.php

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1c64256bc9b414bbaf5072e4affe81a7d35eca56c63e15d2000baecf77148483		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5489 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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