RTF malware analysis — malicious · 0763948feacc0f9c

MALICIOUS

RTF

821.3 KB Created: 2018-03-31 16:32:00 First seen: 2018-04-23

MD5: cdb0fb687c9b75340d6d4e93f4cb7680 SHA-1: 5677fcb140d55e2d690ebdce4d5433fec11441a4 SHA-256: 0763948feacc0f9c1245ed16e8cdb033edb4fb7dacf0f17437629491b097e3b4

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, indicating an attempt to activate these objects. The critical heuristic firing for CVE-2017-8759 confirms exploitation of this vulnerability, which is commonly used to download and execute arbitrary code. The embedded URL is suspicious and likely part of the exploit chain.

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.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
\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 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 In RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002cb9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2CB9	27707 bytes
SHA-256: `fdcf2e90229a591dc28bcc6f252601eae0fe259cfbb1c60e08b3e7c24d910fba`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_01_off000164ea.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x164EA	27707 bytes
SHA-256: `afdf68a71fa187684714542b758b61120cf7c7ee7df654f57cfdab568865f9a9`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_02_off00029d1b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29D1B	27707 bytes
SHA-256: `f909f7c69406cca7aba79d3e106feae382eb839fbbc25e593841dc34ea23ee28`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_03_off0003d54c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3D54C	27707 bytes
SHA-256: `d5d3d92d5a839051b8ee2c0e3e0ff13a565453866468639230a77894755fff81`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_04_off00050d7d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x50D7D	27707 bytes
SHA-256: `0635a67b465368843b79af673e196e24f73adc1a5d7f30ad807c3a721dc65dfa`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_05_off000645f8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x645F8	27707 bytes
SHA-256: `cbf5e4fc46fb51bf95dad3172ebec5e2417a8ee6ed7486200153c08b96eba4ce`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_06_off00077e29.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x77E29	27707 bytes
SHA-256: `840ee1724ee9f4e9b5b27b687836ec29a5de06cdcf672a83070af47bab36dec5`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_07_off0008b65a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8B65A	27707 bytes
SHA-256: `e41a2103db26ee92e4761213730738e5343defcfff54e816431deb3d6bf23397`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_08_off0009ee8b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9EE8B	27707 bytes
SHA-256: `51b0ca0cc20cf806502843656e62196b71ec35cb95adc9ec43d4a1e4ee6409ba`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_09_off000b26bc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB26BC	27707 bytes
SHA-256: `92f449c4219dcf1649414c515a13b1579c34bc23510f6f10be38ea6cb726faea`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely

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