Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 2a8fb09c696dffcd

MALICIOUS

RTF

312.9 KB Authoring application: Riched20 10.0.17134 First seen: 2021-02-20

MD5: 4c8790499709bb6ce228ca0c99cfe86a SHA-1: 01c0512015b9f0f80173cc3ded25e384517b91b5 SHA-256: 2a8fb09c696dffcdbaaee03b8de29d39ccde55d33973f41d118989d9883966d7

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_off00000113.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113	31136 bytes
SHA-256: `1d00df72b6a4921cee492187897b08de973612da584db4bdd810ad84e93d82df`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_01_off0000fb48.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFB48	31136 bytes
SHA-256: `db3e84648a6a6c7320891540fc7c874db3d1f9f5dbae9572ec23883c36639237`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_02_off0001f57d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1F57D	31136 bytes
SHA-256: `4d27bac0d9d04c4d997be702ec7d7320cdc60f652d246d6a8fe4e22829c1e2cd`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_03_off0002efb2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2EFB2	31136 bytes
SHA-256: `ddbe1ae993ad9e36714c79fbc10b3cc82129cff3a5775e5384f0b021a69c1998`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_04_off0003e9e7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3E9E7	31136 bytes
SHA-256: `1c400f6e7614787ec7047f9e34c27988a86221563f1494540121396d4d1e37a1`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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