Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · bbcf6356afc7ecbd

MALICIOUS

RTF

323.2 KB Authoring application: Riched20 10.0.17134 First seen: 2021-10-04

MD5: 0fc84fbc279f76fedffde644c59d93db SHA-1: faa30d6bb5eb311093091dc4eb4dd1b9d4dcdae1 SHA-256: bbcf6356afc7ecbd9215cf907849d4d3541605897cf26bd0e76ffa6cb36f31a8

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 OLE object-related heuristics, including \objdata, embedded objects, and \objupdate, indicating a likely exploit attempt. ClamAV signatures identify it as Xls.Malware.Sload-7135989-0, a known malicious variant. The presence of OLE objects strongly suggests an exploitation vector for client execution, likely delivered via spearphishing.

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 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000113.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113	32160 bytes
SHA-256: `2cf0690acf2fa9aec18db668940a7c0008fa23153a92678594ff90a39026e122`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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