RTF malware analysis — malicious · 1f051cd3571f5267

MALICIOUS

RTF

3.6 KB First seen: 2021-06-13

MD5: a95974452b89dd18052c1a4e3902d461 SHA-1: 87ae6c4e933ee76fb0f308ac754a65d6d6780f9e SHA-256: 1f051cd3571f52677c7f52452b2d2d85036025b79630d95feebaec0d08fc77c0

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically targeting the Equation Editor component. The presence of ".objdata" and ".objupdate" directives, along with a critical heuristic for a split hex Equation Editor ProgID, strongly indicates an exploit targeting this component. This exploit likely leads to the execution of shellcode, as suggested by the 'Shellcode candidate region' finding in the static triage.

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 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000c0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC0	1594 bytes
SHA-256: `2129ff63cfb84c65ad24b5d8018f4ad5096f0b0a401d90d3eb53d4305b0bd291`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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