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

Static analysis result for SHA-256 821e2da65a9ff2aa…

MALICIOUS

Office (OLE) / .DOC

64.0 KB Created: 2007-08-09 06:27:00 Authoring application: Microsoft Word 9.0
MD5: fc80b4f4ed978b4a2ad94e1e8c90bb46 SHA-1: 297fde4f85552b4a18c26efc6ac106d85b71cef2 SHA-256: 821e2da65a9ff2aa5c8d097b51b7ad6ce2774fbd1f2a1f2842af79a963533e7d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1555 Credentials from Password Stores T1027 Obfuscated Files or Information

The sample is a Microsoft Word document with a significant amount of slack space and an embedded PE executable. The document body contains what appears to be legitimate Lithuanian healthcare center information, but it is heavily corrupted with non-readable characters. The embedded executable is the primary indicator of malicious intent, suggesting a delivery mechanism for a secondary payload. One extracted URL points to a JavaScript file, which may be related to the payload delivery or obfuscation.

Heuristics 3

  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 65,536 bytes but its declared streams total only 17,048 bytes — 48,488 bytes (74%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • 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://show.textads.lt/scripts/show_ads2.js\
    • http://adlt.hit.gemius.pl/_

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_00006000.exe
34f3e2b980dc99cec85bd20ec3ef6f0b79cf825660431ab5da864aea6a9aeda6
embedded-pe Office MZ+PE at offset 0x6000 40960 bytes