Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 3ffd5ce69bbf8e4a

MALICIOUS

RTF

313.0 KB Authoring application: Riched20 10.0.17134 First seen: 2020-12-25

MD5: 481f42248aaa3e02f00dc453a8eeaff2 SHA-1: 323a67a4f70c559d04162441e37078676ebb4e07 SHA-256: 3ffd5ce69bbf8e4a1ca9291744e71fa60bc1b863e5a15268f5b42c43b79dae83

220 Risk Score

Malware Insights

Xls.Malware.Sload-7135989-0 · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, with heuristics indicating that \objupdate forces OLE activation. ClamAV detections identify the embedded content as 'Xls.Malware.Sload-7135989-0', suggesting it is designed to exploit vulnerabilities for client execution. The presence of OLE objects and the activation trigger strongly imply a malicious document intended for delivery via spearphishing.

Heuristics 5

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 5 \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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000011d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11D	31136 bytes
SHA-256: `3697bd155d9b835d834c81575a74517554a6cacabc35a2921f03c6dd112a19b3`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_01_off0000fb5c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFB5C	31136 bytes
SHA-256: `a95e1ce1a5285c6e2f54ad3848b9b4a12859d29036f595d0fcd84e88cdab2ee9`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_02_off0001f59b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1F59B	31136 bytes
SHA-256: `c624cc58f019fd99e729429f7440401ce26f40e83ec9c9027b394171d446635e`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_03_off0002efda.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2EFDA	31136 bytes
SHA-256: `4ef658252a538255807ac96a1e62ccb0bb95e75bae0f76616b98d577b7668724`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_04_off0003ea19.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3EA19	31136 bytes
SHA-256: `284f89a3b1a61f97ba30906e4ce85869ba59872f54fe44888ab03a4de0695a21`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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