RTF malware analysis — malicious · 70d1a011e1090d8c

MALICIOUS

RTF

1.15 MB First seen: 2021-06-17

MD5: a3115633e0258ab9847948065e836193 SHA-1: fc054c21c2eda40859da231acc9d4114e66337f3 SHA-256: 70d1a011e1090d8cf8a1f3763ea20c72704759c353f551c43051d116debc5ce0

220 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, including embedded OLE objects and specific heuristics pointing to the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_ACTIVATION_RELATED` strongly suggests exploitation of this known vulnerability for client execution. The `RTF_OBJUPDATE` heuristic indicates that the embedded object is forced to activate, likely to trigger the exploit.

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.
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 2 \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_off00000f58.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF58	45692 bytes
SHA-256: `58218377c606fa03ae3e98ba58aac95154c45426ca2a2c4bf6a5f34d104b45d5`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.ScriptFullName
`objdata_01_off00029082.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29082	254566 bytes
SHA-256: `d58e45cc3a60ce012b53972ea70846c80b4219924e4d59541626e9dbb3083e1d`

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