RTF malware analysis — malicious · 1d8fb989796969a5

MALICIOUS

RTF

674.4 KB First seen: 2021-04-01

MD5: 13f6c82a3236e848bfc7166043157f17 SHA-1: 7d902a11b95d8db8df1f4e7adddf7d05cc78bc90 SHA-256: 1d8fb989796969a5ecc5c589cdd99d3d9602cde258b61610efaeb7985a81696c

200 Risk Score

Heuristics 6

Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED

RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
\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.
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
Suspicious extracted artifact medium 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000001a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A	343518 bytes
SHA-256: `4f116bbc178478987a1f84e6f03d00d93673d584e49628e437dbb1094716af42`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: heap spray 0x41 (A) Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000a7c05.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA7C05	1709 bytes
SHA-256: `6ef048de06e9c2e6b420e78a489e52123766b08549a074a5f95b98ffe8558f38`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS
`objdata_02_off000a7c15.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA7C15	36 bytes
SHA-256: `8935eb605040753f89379b3f05c2cdaefba833ec64299ed9c258020f4c1217b0`

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