RTF / .DOC malware analysis — malicious · 13e1a89d0793e5c6

MALICIOUS

RTF / .DOC

234.7 KB First seen: 2022-07-21

MD5: 1caa525fa547f4fa165c55d4c8a38ac2 SHA-1: 0658479cb9b97ae99aaa30bc53186b09d9117ca5 SHA-256: 13e1a89d0793e5c67b1322a8a51438137d61944a5c9e1170b3c4d08c6f86eb8e

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE objects and triggers CVE-2017-8570, which is known to drop and execute a script. The embedded OLE objects and the specific CVE exploit indicate the file's primary purpose is to execute a secondary payload. The extracted artifacts are the most relevant IOCs for further investigation.

Heuristics 6

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
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_off000007d2.bin` `ac9f454bbeb2affcdfec4cd20a26f84666baf61ac062c523a37387fcc5bad25d`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	24155 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000ccb2.bin` `81ac98515bd4de25fc9f4148c41d6c0b489643c09de1fbb1e6bb969a785f1b01`	rtf-objdata-decoded	RTF \objdata at offset 0xCCB2	2632 bytes
`objdata_02_off0000e255.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xE255	12297 bytes

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