Rtf.Dropper.Agent-7126038-0 — RTF malware analysis

Static analysis result for SHA-256 9001056791a03ec9…

MALICIOUS

RTF

19.2 KB First seen: 2019-11-20
MD5: d1c3fa000154dbccd6e5485a10550a29 SHA-1: 43d1a6dafa56795bc544476b9122ce5b86f179fe SHA-256: 9001056791a03ec998f26805d462bc2ca336b2c3aeac2e210f73ff841dfe3eec
282 Risk Score

Malware Insights

Rtf.Dropper.Agent-7126038-0 · confidence 95%

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

The RTF file contains an embedded OLE object specifically identified as related to CVE-2017-11882, which is a known vulnerability exploited for client execution. The object's native payload is decoded and appears to be shellcode, suggesting it's designed to download and execute a secondary payload from the provided URL. This indicates a dropper functionality, likely delivered via spearphishing.

Heuristics 8

  • 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
  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
  • ClamAV: Rtf.Dropper.Agent-7126038-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7126038-0
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact medium 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.
  • 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://webserv-redir.net/includes/b7199e61/-1/5272/fdbfcfc1/final In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000039.bin rtf-objdata-decoded RTF \objdata at offset 0x39 9781 bytes
SHA-256: 59195bfef45a861d94fefbb7274ba06011f7a4affd118420992671e7510cb0b9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
objdata_01_off0000004c.bin rtf-objdata-decoded RTF \objdata at offset 0x4C 35 bytes
SHA-256: e0f28ce3138172e7f0d29be00b7cfbd17d822420ce29f7663ca1be8ad04df92d

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