RTF malware analysis — malicious · ebd3c1740f6b26c4

MALICIOUS

RTF

47.6 KB First seen: 2019-11-20

MD5: 8faf594eadaac900d736c40aad66dc8b SHA-1: 3ff8c4861aaabbceea7a80ffe79e84284b2de57e SHA-256: ebd3c1740f6b26c4afacc62470e33e32583240c12b715480a82bcddd186edefe

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and utilizes the ".\objupdate" directive, strongly indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). This technique is commonly used to deliver secondary payloads. The extracted OLE object data files are the primary indicators of compromise.

Heuristics 4

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.
\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 2 \objdata section(s) — embedded OLE objects
Suspicious extracted artifact info 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000041f1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x41F1	3800 bytes
SHA-256: `6bd8dc3ae4ab59c28d8238532a583355b8507a772ea691fe5e10bb980d893ebe`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`objdata_01_off000082c4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x82C4	2954 bytes
SHA-256: `82a3efcc0f648bf1d248765ca49b4f6d564afe80409a01eada795df3d156fb75`

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