Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 6310e65faf3e4d77

MALICIOUS

RTF

625.6 KB Created: 2018-06-12 21:58:00 First seen: 2018-06-21

MD5: 32b4b36057dbfe68c7a40f29258b3974 SHA-1: 52b075a34f8f41b3c296f27ee0a7150884d9d5ec SHA-256: 6310e65faf3e4d779229257ab35a335a39a2fe1ae631e1f0f9e6ff35ac13fb04

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 7 \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_off00003c76.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C76	29243 bytes
SHA-256: `7606f5b02025b6e5c4112dd0a62c09904a4c71bdc1b23ef81a40632ce8222d7f`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_03_off0003f27d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3F27D	29243 bytes
SHA-256: `0d63947757cbc20adbdd6a1e8bfc5e03f8688182f37889729f7d8fc74f4e1294`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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