RTF / .DOC malware analysis — malicious · 53f19ff0d881928d

MALICIOUS

RTF / .DOC

1.51 MB Created: 2020-03-04 17:45:00 Authoring application: Riched20 6.3.9600 First seen: 2023-03-10

MD5: 59d8a04dcff000892defdddeba33c197 SHA-1: 91d8a1d6614952020fc2f5a4a09373976ac61cbf SHA-256: 53f19ff0d881928d7f6947554c8a72f9ac6c0d6e16a5728ea78e1df0477cdd4e

402 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an RTF document that exploits the CVE-2017-11882 vulnerability in the Equation Editor component. This exploit is known to embed and execute malicious code, likely a second-stage payload. The presence of OLE object data and excessive hex data further supports the delivery of an embedded executable.

Heuristics 10

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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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
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
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1531KB of hex-encoded data inside \objdata sections — may hide a payload
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
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://schemas

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ed.bin` `b3f33a84437f3dd7faac8e3dc053175be652918700d5f3305571e3e13621c920`	rtf-objdata-decoded	RTF \objdata at offset 0xED	765974 bytes
`objdata_01_off0017fd35.bin` `e56627a0a249feecf71c66bfd161cb50cfc36aa4456a7f68bf00a3d84820b2d8`	rtf-objdata-decoded	RTF \objdata at offset 0x17FD35	3546 bytes

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