RTF / .DOC malware analysis — malicious · a20a0a649fbba474

MALICIOUS

RTF / .DOC

336.0 KB First seen: 2022-09-19

MD5: dcc439973a3dd0d78b0ed1713b620dee SHA-1: a647444280760cfb532f8a27782e34dcc6e52998 SHA-256: a20a0a649fbba4745081629657a49edb6fefcbaf20388196967a4b134e603a8d

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File

The RTF document contains OLE object data and specifically triggers CVE-2017-8570 through a composite moniker. This vulnerability is known to drop and execute SCT scripts, indicating a likely initial access vector for further malicious activity. The embedded OLE objects and the use of ".objupdate" further support the exploitation of this vulnerability.

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_off000007d4.bin` `3a8a2658ea3356ac151395f6929dd510578deba764c5165c92c0c97e1e5bce55`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	74033 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000261f6.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0x261F6	2632 bytes
`objdata_02_off00027799.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x27799	12297 bytes

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