RTF malware analysis — malicious · 251d3a1bc3a52859

MALICIOUS

RTF

225.0 KB Authoring application: Riched20 6.3.9600 First seen: 2019-01-11

MD5: 2347514a176733089ab6901d559094ad SHA-1: 34a2c3097bc06409b04698c6d2e19bbbf080fa34 SHA-256: 251d3a1bc3a5285919ba7979ad3d13d5dfc54859785d44db9c409e7a07f467a2

522 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of malicious activity, most critically the exploitation of CVE-2017-11882 through an embedded Equation Editor object. This exploit is designed to execute arbitrary code, and ClamAV detections confirm the presence of a trojan. The embedded URL is likely related to the payload delivery or C2 infrastructure.

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
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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.Trojan.Autoit-7057866-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Autoit-7057866-1
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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
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 3 \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://www.ibsensoftware.com/ In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ef.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF	106727 bytes
SHA-256: `523cc76aecaba73903148502d3ef93fca90d442ea42544aa37380a8a79b73f42`
Detection ClamAV: Win.Trojan.Autoit-7057866-1 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, NOP sled, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress
`objdata_01_off0003430c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3430C	3980 bytes
SHA-256: `6033a6f346696e6427d1cb49b4f908a514957f2cee708cc87534aabd8f5343ce`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\Server.exe &��D$,f-Q��%
`objdata_02_off00036552.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36552	3546 bytes
SHA-256: `4b45b86a3c31372ff0b8439426f96afcc39a940955c5ffad45fafc003082ed18`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\Server.exe AC

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