Xls.Dropper.Agent-7119837-0 RTF malware analysis — malicious · 8d73f341875c03f0

MALICIOUS

RTF

989.1 KB Created: 2019-03-16 09:12:00 First seen: 2019-04-18

MD5: bde14a9ffa3bf159d7a9d0e44cf0e869 SHA-1: e4103ad7079065f43aafd9d005e68d946b558385 SHA-256: 8d73f341875c03f06568efb771e90dcad5e814e8a29d5013cb68dc82d73c3054

282 Risk Score

Malware Insights

Xls.Dropper.Agent-7119837-0 · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, indicating an attempt to activate them. The critical heuristic firing for CVE-2017-8759 strongly suggests exploitation of this vulnerability for client execution. The ClamAV detection name 'Xls.Dropper.Agent-7119837-0' further supports the dropper functionality, implying the file's primary purpose is to download and execute a subsequent stage.

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.
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.Dropper.Agent-7119837-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7119837-0
\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.
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 10 \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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002a96.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A96	37422 bytes
SHA-256: `1e000f86f338e3b4d5042dfb51bef0edb08dd18299dc946f13f284b512e06688`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off0001a5df.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A5DF	37422 bytes
SHA-256: `c0b4685673d4bf89298890ff5ebddff3301b60a5fac02f93ab9a801a1d70ac83`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00032128.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x32128	37422 bytes
SHA-256: `f4f352539c41afd5a7856582f0643e9d18ffd7d62a0fe028e79c69c06f361cfa`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off00049c71.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x49C71	37422 bytes
SHA-256: `ae59bd87a8f838d18a67aa256b907c7f8f128a060ea6528b6a6bf2337c72a803`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off000617ba.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x617BA	37422 bytes
SHA-256: `af72e8ac6b921bf5587a4d05e84bc6cfc51491a908190d7bc3dc41c461fc7802`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off00079303.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x79303	37422 bytes
SHA-256: `308e6ccc899817715904fc50870a1435c05db7d91d75da47245722d9277963fa`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_06_off00090e4c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x90E4C	37422 bytes
SHA-256: `b9e6ed1eff22fac74c3b3301eeddb11fbf9a30626a728c6490fbe87765dfb6c4`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_07_off000a8995.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA8995	37422 bytes
SHA-256: `470ef07f796ddf2219b48018c132170332be11706dbb03e9479ef4c29fdee758`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_08_off000c04de.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC04DE	37422 bytes
SHA-256: `ddda842e23a64d8e12aa3622ace33b8460ef59aa5aef48d5a53afd0e7a2d7e96`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_09_off000d8027.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD8027	37422 bytes
SHA-256: `b796effb9e352ba16578609894e01323a07d240eba837353ee249884787a7cfe`
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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