Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 5f762589cdb89553

MALICIOUS

RTF

402.0 KB Authoring application: Riched20 10.0.17134 First seen: 2019-05-31

MD5: 32bd0fe672eb968529a551b3c26b02ca SHA-1: 5fa99e99592de1fcb9473a17dd3cc9fbab9457d4 SHA-256: 5f762589cdb8955308db4bba140129f172bf2dbc1e979137b6cc7949f7b19e6f

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 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000113.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113	40022 bytes
SHA-256: `44d61e4da07291d8e0e0faba6f80dc9dde13c780f7f3b39676cac3e9f2551078`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_03_off0003c54e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C54E	40022 bytes
SHA-256: `cbf155cc1dce21c706ecd17d8e66dec3ca4af841b0b8487a2cdfeec568ef55e7`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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