RTF / .DOC malware analysis — malicious · 39e6d2cfe42c41a7

MALICIOUS

RTF / .DOC

257.0 KB First seen: 2023-01-30

MD5: fddce2b3c97faecb1feb8fea47edf53e SHA-1: c5fdcd9c686970724faee24edab87663a16e92eb SHA-256: 39e6d2cfe42c41a7d571ed30431236b6383b064e1ff0b72757457e9cc4ae46c1

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment

The RTF file contains OLE object data and triggers ".objupdate" which are indicative of exploitation. Specifically, the "CVE_2017_8570" heuristic firing confirms the use of a composite moniker to drop an SCT script. This script is likely intended to download and execute a second-stage payload, making this a downloader or initial access mechanism.

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` `2aa264605f5902ee17a30514bf31c470f1e7e38eed4597a2d918cd3c440f2a75`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	35098 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0001259e.bin` `24fedef2d4fe5e3d6666fae2543850c54134511ad6be8583d5aa0438ef699c5d`	rtf-objdata-decoded	RTF \objdata at offset 0x1259E	2632 bytes
`objdata_02_off00013b41.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x13B41	12297 bytes

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