Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 26c04e523c787374

MALICIOUS

RTF

6.80 MB Created: 2019-01-22 08:41:00 First seen: 2019-03-18

MD5: c5927f4da18742336ef343e05057a7bb SHA-1: 3f61e42086b9f736e1346bda4b78f83f4555615d SHA-256: 26c04e523c7873747ff51198cead3a3ba73eb46e01ae62554d0f37736afb40d7

282 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 significant amounts of hex-encoded data within OLE objects, and heuristics indicate the use of \objupdate to force OLE activation. Critical firings for CVE-2017-8759 and ClamAV detection of Xls.Malware.Sload-7135989-0 strongly suggest exploitation for client execution. The embedded OLE objects are likely used to download and execute a secondary payload, consistent with a spearphishing attachment.

Heuristics 8

CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~6684KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
OLE object data medium RTF_OBJDATA

RTF contains 3 \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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00672759.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x672759	42030 bytes
SHA-256: `9582b6c90d134fba1ff252a7ea44d9de551523964c0374784168812622eb6aeb`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off0068c85a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x68C85A	42030 bytes
SHA-256: `57a199d751c7c7a6a6268d45d6c78e4151979233f19c049e9e1e10029bc6386b`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off006a695b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6A695B	42030 bytes
SHA-256: `57774963027d55d1c561f8f5f797a33ca5d045f56573fa76db35e05fea443923`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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