RTF malware analysis — malicious · 1db2779a7b22590b

MALICIOUS

RTF

11.7 KB First seen: 2021-06-30

MD5: d852cd3c154c4f51e69f5c55962c1570 SHA-1: f3171055c27e4fb6c5c1664d232e30a20ec7616c SHA-256: 1db2779a7b22590b103c71a474e926b6332a5bffc508bb2f9fc147de72cbbff2

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, a known vulnerability exploited for client execution. The \objupdate directive forces activation of this object, which likely contains shellcode. The extracted artifact 'objdata_00_off00001bff.bin' is flagged as a shellcode candidate, supporting the exploitation of the Equation Editor vulnerability to download and execute a secondary payload.

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 1 \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_off00001bff.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BFF	1377 bytes
SHA-256: `e9e42cda3a6393e3726ddaea15f85a96bb42318e595ddb491e2b60c245e25cf5`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

Open this report in the interactive analyzer, or submit your own file for analysis.