Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 830fc1a773c9fa81

MALICIOUS

RTF

323.2 KB Authoring application: Riched20 10.0.17134 First seen: 2019-08-04

MD5: efd8dbc78339f2bbfa99b4854708aaa2 SHA-1: c2e51b2b9c46949d084a2343f8ae5e044fe8245b SHA-256: 830fc1a773c9fa81f37f9108395ce43bfefe5df8ab72fa42075186bb2a5af42f

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	32160 bytes
SHA-256: `4ee56b19d8f3a1f83f675a890de4a29cb6d870bcde1f70a68a962d73fb8f5a1a`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_01_off0001037c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1037C	32160 bytes
SHA-256: `e56af8a43b6af7a827681983fac8ce3a2e3c2458badf12ceb6b4bdb524ff5c26`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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