ImminentMonitorRAT — RTF malware analysis

Static analysis result for SHA-256 1cea68e4108e5b40…

MALICIOUS

RTF

1.27 MB First seen: 2019-04-18
MD5: ee7450e3daa3f3ab46f56f17c44c470b SHA-1: 9b435c95da7a945d7cc9b58459a73177837b5abe SHA-256: 1cea68e4108e5b409870d1a41e20d49108aff81ed87c22b1eeb99dbf8a1b50b1
502 Risk Score

Malware Insights

ImminentMonitorRAT · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, including OLE object data, embedded OLE objects, and specifically the Equation Editor CLSID, which is a known vector for exploiting vulnerabilities. The presence of PE headers within hex data and the ClamAV detection as 'Win.Dropper.ImminentMonitorRAT' strongly suggest this file is a dropper for a RAT. The embedded URL is likely used to download the secondary payload.

Heuristics 12

  • 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
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • ClamAV: Win.Dropper.ImminentMonitorRAT-10024542-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.ImminentMonitorRAT-10024542-0
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1305KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 7 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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://itest1.ru/newbuild/t.php?thread=0&stats=send In RTF body

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000867b.bin rtf-objdata-decoded RTF \objdata at offset 0x867B 400 bytes
SHA-256: fa79b00817f7495218632b8aca05100fc72b724a674512e970aa8642ceaa44bc
objdata_01_off000089d5.bin rtf-objdata-decoded RTF \objdata at offset 0x89D5 635066 bytes
SHA-256: e4519682de26ac291f1cac70d64e4ccb7a77b12803fbd3d161d403edbd3180f5
Detection
ClamAV: Win.Dropper.ImminentMonitorRAT-10024542-0
Obfuscation or payload: likely
Carved artifact entropy is 7.90, consistent with packed or encrypted content.
objdata_02_off0013eb8e.bin rtf-objdata-decoded RTF \objdata at offset 0x13EB8E 369 bytes
SHA-256: 338e71905e7d912ec27b0c9a9855f2581e592611183df26bee7c4ccfe9bcd35f
objdata_03_off0013eeac.bin rtf-objdata-decoded RTF \objdata at offset 0x13EEAC 2352 bytes
SHA-256: e961bf4fa70bd245f65ffa24c14ff473f07262c52a7a2871f7a05e49df2defce
objdata_04_off0014014a.bin rtf-objdata-decoded RTF \objdata at offset 0x14014A 727 bytes
SHA-256: 92b12466cc9a09198d1718a0c3c9615881a1bdeaa0e674afc8c64c7380214ef9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript" & ".Shell")
objdata_05_off00140789.bin rtf-objdata-decoded RTF \objdata at offset 0x140789 2620 bytes
SHA-256: 26972b1614c32c4381b23aef5580898916029618e6f3e236b5e7cbab61b417d8
objdata_06_off00141d92.bin rtf-objdata-decoded RTF \objdata at offset 0x141D92 4681 bytes
SHA-256: 75bdf0d3e6198ce8609d72f965634443d1596df6ed427f655b94bb1d92e195e5

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