Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 3ff73c04659bbe32

MALICIOUS

RTF

495.5 KB Created: 2018-06-07 13:08:00 First seen: 2019-08-04

MD5: fc0dcb8f0f0c1adf494aa53ca98f2ece SHA-1: 4628803dd29250c24a6a4135b9425c082e8be531 SHA-256: 3ff73c04659bbe32ee28e3c880da3731cd0cc1f2fc1d466cbd2f9a00f06ceb24

242 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 ".objupdate" forces OLE activation and the presence of Composite Monikers. ClamAV signatures identify the embedded content as Xls.Malware.Sload-7135989-0, suggesting an exploit targeting spreadsheet functionality. The primary attack vector is likely spearphishing, with the embedded OLE object serving as the malicious payload.

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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00003d28.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3D28	32827 bytes
SHA-256: `dc841d6ff4ec7ec7c0a2e4e5e18ee0b796f0b8a4bb582a67fc4e23ef194bbf5e`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_02_off0002ef00.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2EF00	32827 bytes
SHA-256: `42d797c22c315ef0caefdc5c08f5c1991777ce2d1c14df9c41b31650a8a80d8e`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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