RTF malware analysis — malicious · 6357499a0687dfb6

MALICIOUS

RTF

926.8 KB Created: 2018-05-04 05:23:00 First seen: 2019-05-31

MD5: 1ed8d12cb5b92778cd15d92924205ec2 SHA-1: 6e9783a4978918307777c8e6d4cbe9e81096afc0 SHA-256: 6357499a0687dfb654b8d53561c922b4662331e30fbeca4fb87577431c073c70

262 Risk Score

Malware Insights

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, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

Heuristics 6

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: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
\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 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_off00002c6c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C6C	31803 bytes
SHA-256: `04e5958c96bea93fc42c258fcfc92e2a12e23edb90b2511a542c5741cbd0dab9`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_01_off00018bda.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18BDA	31803 bytes
SHA-256: `f0513839ff8fafeb3b2aa8191457153151fac181c29e5675e50dcda2e5381f1f`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_02_off0002eef3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2EEF3	31803 bytes
SHA-256: `7f222bccb5494e83729adcc0e1a17887cfb8b268621590506ed398d2a67d8865`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_03_off0004520c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4520C	31803 bytes
SHA-256: `fc6706d787851f8b90357eeaca6376cce3bf67ea72981abd6f080015e9e5612b`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_04_off0005b525.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5B525	31803 bytes
SHA-256: `15b4baac4fe42bcc295349d1d3c73837d9cb7c42a3ab0c53d28376af5058e6c6`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_05_off000718bf.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x718BF	31803 bytes
SHA-256: `97f150ed0a6bf5303e52cd5f4116dfabf72a7b23e13860777a5720d7a355cd6e`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_06_off0008782d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8782D	31803 bytes
SHA-256: `9e5de23b7d165d9635b7f154d8f60297b13cfb73e8c5ca2a477ebe6171ba62e8`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_07_off0009db46.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9DB46	31803 bytes
SHA-256: `29ddc3750cdf7f442fedefe0bbf30cbd5e41b5e13cbde9fcad4366c1e3f8643e`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_08_off000b3e5f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB3E5F	31803 bytes
SHA-256: `1cd76db7b24485c116cd07a1ac35f7b1f4cdf7e85c881d86211278429d1c2b90`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_09_off000ca178.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCA178	31803 bytes
SHA-256: `8f50c2126526b195cf99856a3628abba6590e78d90aa4f49ff93b7dac0f6bb6e`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

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