RTF malware analysis — malicious · 56fddefb93f4676a

MALICIOUS

RTF

1.61 MB Authoring application: Riched20 10.0.17763 First seen: 2020-08-10

MD5: 750d22588e045cc40cf3c570f5586793 SHA-1: bbfed7a002ad199fd2f61579249972b58754ce1a SHA-256: 56fddefb93f4676aaddd7082b5e6cca2c04d2e8a12dffb8bf7e972c60ba079c8

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 ~1012KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 10 \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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000113.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113	82280 bytes
SHA-256: `8e97ec13d36d54b43d2cb1b7dac3586faf0cdb25b14ca4ecbdd04c044e77605b`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_01_off00029518.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29518	82280 bytes
SHA-256: `30bbc6e4e23d1eba590ea1d618556a049e32a795dd6cb824dbf22f7d2c8f0fb1`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_02_off0005291d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5291D	82280 bytes
SHA-256: `40156da08d3ba97a6524b650103adffe5d90fc9bf9e0e4b40021306835eb8846`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_03_off0007bd22.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7BD22	82280 bytes
SHA-256: `1b15276c4350152195df9ae7c11e7adddefe0c552f0228fe24075db29d69a9bf`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_04_off000a5127.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA5127	82280 bytes
SHA-256: `3ad7406c0b906b48551c0e1927bcd164d48a037958301fd2d1ba4ce161deee6e`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_05_off000ce52c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCE52C	82280 bytes
SHA-256: `6353f4dba3de76027d6763c26668d845932aa49e8b3e1446c685789350b49991`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_06_off000f7931.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF7931	82280 bytes
SHA-256: `3877eeec832bb785aac25b0f89f35849f0d34d13db214bf8e9644309ee7fb085`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_07_off00120d36.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x120D36	82280 bytes
SHA-256: `b121f6647368a2ab8d5a59e572bb23fb9a5848e8ca9e59caabe8c01b661c6897`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_08_off0014a13b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x14A13B	82280 bytes
SHA-256: `93f4952d94bf35a256863c02e13b4550349e87d3581864d44703bf6ce8f8c88f`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely
`objdata_09_off00173540.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x173540	82280 bytes
SHA-256: `2554a65f945710db75447690d9f93f245029716e31f164c9a1e848ba2a904320`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.