RTF malware analysis — malicious · dc7da540ce83cbcb

MALICIOUS

RTF

919.0 KB Created: 2018-05-10 15:52:00 First seen: 2018-05-18

MD5: 827137fe4802dcd945b5dcef27918761 SHA-1: 14d68767fd11cbad6165b3532ee625ff1ed86526 SHA-256: dc7da540ce83cbcb113bd2472931e492b91eec5dc3a3cc856bc70b9db836fd4f

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.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 In RTF body

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c8f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C8F	33339 bytes
SHA-256: `629d64b02682881d97312099e71ee8f7afea11fd7f27c1c0f94745e1969f7236`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_01_off00018bcc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18BCC	33339 bytes
SHA-256: `1daddd205937183729d7030f43c9d7f1dc9eb80dc65ad85ec0f23aeb84e9c736`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_02_off0002eb09.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2EB09	33339 bytes
SHA-256: `6a24c3a6f9eb2069ee870bf6f71d55671bb0a011fd150b82de09b9b91441d6f9`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_03_off00044a46.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x44A46	33339 bytes
SHA-256: `41fdc3b3d7dc6292be56252e97decdc5f381b62fa0d71a3c03aeb0ae91c8f322`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_06_off00086849.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x86849	33339 bytes
SHA-256: `4c8c17899ca97f94e38d7ede8d07ed845c92226666973bd60bb54ca1d2df9559`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_07_off0009c786.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9C786	33339 bytes
SHA-256: `d011b8675378cdfd19d88a0566f4ebec2f2dea7e7e6eb3420cb2004ad071051d`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_08_off000b26c3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB26C3	33339 bytes
SHA-256: `916f15deea74d04605a1d370a2b5284bea1b8c5a7a818ff3f7f7d47255739af8`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_09_off000c8600.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC8600	33339 bytes
SHA-256: `e573ec0ecc3fd8e1def0a224023376ebd9aef4ef13297ce6118b8bcaa6f0e63c`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

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