RTF malware analysis — malicious · 002aa27f885a41c0

MALICIOUS

RTF

1.16 MB Authoring application: Riched20 10.0.17763 First seen: 2020-09-24

MD5: d7fe21a31639cb7fc530cf01b216db75 SHA-1: 51bd5efbe0b8655212ffae41f921a37be3d15af0 SHA-256: 002aa27f885a41c0108156bbd72c08479d7eb0fc7bcfd49a9cc490c1954c5e7e

300 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with ".objupdate" directives indicating an attempt to force activation. High heuristic scores for excessive hex data within these objects suggest a hidden payload. ClamAV detections of 'Xls.Malware.Stratos-7506050-0' on the main file and an extracted artifact further confirm malicious intent, likely involving exploitation for client execution.

Heuristics 7

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.
ClamAV: Xls.Malware.Stratos-7506050-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Stratos-7506050-0
\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 ~1064KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 8 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000113.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113	74088 bytes
SHA-256: `0a8bf96a128f3c69686c7944a6f4666d6e2bde70dcc3f3f7b37b5ddaf5fc0394`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_01_off00025374.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25374	74088 bytes
SHA-256: `b72b392d0cef12651c491b3901325000d098baca139a6c437421e79d660b3a20`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_02_off0004a5d5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4A5D5	74088 bytes
SHA-256: `a7f86cc6094c62ed81cfcd77b16c29feba0e962a94776e9c73b3ad22e013a633`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_03_off0006f836.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6F836	74088 bytes
SHA-256: `90a700979cf0bec9d7150d8ecbd51ce6d658a0538be4296cf90063ff9aedc496`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_04_off00094a97.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x94A97	74088 bytes
SHA-256: `523e03f1470c36dffaf09c1cf12bfd4caa2cc69d13d831b69905dcf05eb0914a`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_05_off000b9cf8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB9CF8	74088 bytes
SHA-256: `ebea87941586bac816cd0fd69572b880086bfd5feaec6895c22f38f0992d0d5b`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_06_off000def59.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDEF59	74088 bytes
SHA-256: `922cee55be1b62f7180fe3a88e08eac22d995aa3a0d0dd07f4b112e152b3c6c5`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_07_off001041ba.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1041BA	74088 bytes
SHA-256: `6d2b74c1bfdb28a77aeb961292d43b73a36de3324f22495ec6aa257714c5e28a`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely

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