Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · c0f4c74a631f4cce

MALICIOUS

RTF

794.0 KB Authoring application: Riched20 10.0.17763 First seen: 2020-09-24

MD5: aa94cf48c101fb936316498210f9710c SHA-1: 4b044e1921a3cfa96a9e031c6c3fa8224cef9c19 SHA-256: c0f4c74a631f4cce3cd0d3da8744f0ebf8cd11ee5759dbf72c6d626d723f8b7c

260 Risk Score

Malware Insights

Xls.Malware.Sload-7135989-0 · confidence 90%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with heuristics indicating the use of ".objupdate" and Composite Monikers, suggesting an attempt to exploit OLE object activation. ClamAV detections identify the embedded content as 'Xls.Malware.Sload-7135989-0', a known malicious variant. The primary attack vector is likely spearphishing, with the embedded OLE object serving as the exploit mechanism.

Heuristics 6

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.Sload-7135989-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
\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.
OLE object data medium RTF_OBJDATA

RTF contains 6 \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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000113.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113	65952 bytes
SHA-256: `13791eabf2e08b892267f79af009a296fdb326b0226a513b87fdf58e3cd0f023`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_01_off0002123c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2123C	65952 bytes
SHA-256: `c526bd7782b125e5c5f792edbc0ed022fc893a8dd025f0b06e9f1309200e3bb7`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_02_off00042365.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x42365	65952 bytes
SHA-256: `debb5bb58e52d4b307485db8ec567d59dc01e546437ce5b42e5c9f91d9246d7a`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_03_off0006348e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6348E	65952 bytes
SHA-256: `50f412ebdf7dd9a7ad98d4a99f9f47f674afae78f768e6d81234e7fefd90c117`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_04_off000845b7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x845B7	65952 bytes
SHA-256: `1ef6e174c73b059abae1f98fe27ef7c85e7097fd0a0d4d8d9217178755de8013`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_05_off000a56e0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA56E0	65952 bytes
SHA-256: `35b65d1372fbc1d43b28e498b376fc56071e20754564fb05c2e3ec7e25f3f92f`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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