RTF malware analysis — malicious · a01d18669971b635

MALICIOUS

RTF

576.5 KB First seen: 2019-04-18

MD5: c919cec1b4121b51960f28d027999653 SHA-1: 0a23c9996806072171581fca958d5d8aad299b15 SHA-256: a01d18669971b63553908d07bdf219d0078537bbb1d2475fbcd405fbe7652491

462 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, including the Equation Editor CLSID and OLE object data that forces activation. A critical heuristic identified a PE header within hex data, and another flagged an INCLUDETEXT/INCLUDEPICTURE remote URL. This suggests the file is designed to exploit a vulnerability, likely CVE-2017-11882, to download and execute a secondary payload from the URL http://itest1.ru/newbuild/t.php?thread=0&stats=send. ClamAV detections further support the malicious nature, identifying it as Win.Packer.MalwareCrypter-6642003-1.

Heuristics 11

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.Packer.MalwareCrypter-6642003-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packer.MalwareCrypter-6642003-1
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.
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.

Filename	Kind	Source	Size
`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	266114 bytes
SHA-256: `c6b5d176d489814b497d77527d61376bb409f473aa589b32f90597905344616f`
Detection ClamAV: Win.Packer.MalwareCrypter-6642003-1 Obfuscation or payload: likely Carved artifact entropy is 7.77, consistent with packed or encrypted content.
`objdata_02_off0008a91e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8A91E	369 bytes
SHA-256: `338e71905e7d912ec27b0c9a9855f2581e592611183df26bee7c4ccfe9bcd35f`
`objdata_03_off0008ac3c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8AC3C	2352 bytes
SHA-256: `e961bf4fa70bd245f65ffa24c14ff473f07262c52a7a2871f7a05e49df2defce`
`objdata_04_off0008beda.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8BEDA	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_off0008c519.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8C519	2620 bytes
SHA-256: `81d2d72fa68faccfc5765f360b95119de11eee1b7d2fa26b02fb47a3c3ef946b`
`objdata_06_off0008db22.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8DB22	4681 bytes
SHA-256: `75bdf0d3e6198ce8609d72f965634443d1596df6ed427f655b94bb1d92e195e5`

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