RTF / .DOC malware analysis — malicious · c58c10e8e90fe930

MALICIOUS

RTF / .DOC

233.5 KB First seen: 2022-06-24

MD5: 3cfdfeaa4d65ef2df2ed27504283cddd SHA-1: a0bede95eeb9135ce1864d7bcbb920a6a9bf65a6 SHA-256: c58c10e8e90fe930b11fcfa422877bfc375c04559c5af166d879ea5cdc6191a3

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment T1059.005 Command and Scripting Interpreter: Visual Basic T1140 Deobfuscate or Obfuscate Malicious Code

The RTF document contains embedded OLE objects and utilizes a 'Enable Editing' lure, a common technique to bypass macro security. The critical heuristic firing for CVE_2017_8570 indicates the exploitation of this vulnerability to drop a SCT script. This script is likely responsible for further stages of the attack, such as downloading and executing a second-stage payload.

Heuristics 7

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
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.
\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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ba4.bin` `597fa19089096d30ae9312debe65099b063b5727ba715214f24df4dcc928d396`	rtf-objdata-decoded	RTF \objdata at offset 0xBA4	23112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c80a.bin` `625ba87dad062d63542a2f08013c93a4f9eac2363a88c9240f1688e698b82c02`	rtf-objdata-decoded	RTF \objdata at offset 0xC80A	2632 bytes
`objdata_02_off0000ddad.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDDAD	12297 bytes

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