RTF malware analysis — malicious · f4f4bbd2bebb1d39

MALICIOUS

RTF

3.76 MB First seen: 2022-06-21

MD5: c828050ae845dc34d983d64430d3b0b7 SHA-1: 9fbda901e87fdfc21a980dde36b4e8c915a6efcb SHA-256: f4f4bbd2bebb1d39de060934968ddddd6cc8d68353864e971aba35d6807e14b7

382 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model Hijacking T1059.001 PowerShell T1204 User Execution

The RTF file contains multiple indicators of exploitation for CVE-2017-11882, including a split hex Equation Editor ProgID and OLE object data. The presence of a PE header within the hex data suggests that a malicious executable is embedded and likely dropped. ClamAV also detected this file as Rtf.Dropper.Agent-9965975-1, further confirming its malicious nature as a dropper.

Heuristics 10

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.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
Split hex Equation Editor ProgID + OLE object critical 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.
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1910KB of hex-encoded data inside \objdata sections — may hide a payload
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
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_off00001291.bin` `b0661b5b8359f09cc84e68b7575663a059c8919fc01b53ff29cdbd40c50a9d32`	rtf-objdata-decoded	RTF \objdata at offset 0x1291	973099 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.68, consistent with packed or encrypted content.
`objdata_01_off001e7e3c.bin` `ee689f3f3e104d316fdfdcc5da12c6430bbbcc7bd0a9e503676477f2b53390b6`	rtf-objdata-decoded	RTF \objdata at offset 0x1E7E3C	462748 bytes

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