RTF malware analysis — malicious · 8590be384c6ffda0

MALICIOUS

RTF

737.1 KB Created: 2018-05-02 20:35:00 First seen: 2019-01-11

MD5: c3f7b5363692567fc7880197052642f1 SHA-1: 970019e9b32d4b08971d5d25764b0065182adddc SHA-256: 8590be384c6ffda04f9b8250eb5e12380a8c0a81259511fbcd5d63a4161277fc

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_off00002c17.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C17	24123 bytes
SHA-256: `82c73433e10c3379fb681664ea7c00ceec7ee87bebb9cf96f22433a549700bbb`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_01_off0001429d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1429D	24123 bytes
SHA-256: `600b8063a1e6c08be00af92a033c597490dbc7f98f5cf5e0b32a42c8afe34c20`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_02_off00025923.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25923	24123 bytes
SHA-256: `8b435a16b0616a55a3d8fb94e2c6cc95a460673c1efcd76aefc3a584abbe4bb5`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_03_off00036fa9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36FA9	24123 bytes
SHA-256: `001395c292f1af86f6faed0f3a14843b2945a044ce9e32de0c9736d860d2f4c8`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_04_off0004862f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4862F	24123 bytes
SHA-256: `fad13fd7d0bf033f4aa17ea0ac72ef429d47827ffab1e4a0001b3ce52d43d9b6`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_05_off00059cff.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x59CFF	24123 bytes
SHA-256: `66516a162723e66182a2eefcf9c9ca33b3dd08f7f233450480243568997982e0`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_06_off0006b385.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6B385	24123 bytes
SHA-256: `fa5986432731089ff20bd1bd518c5b9542cae35d2f6dd0108be714fd903e8cf5`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_07_off0007ca0b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7CA0B	24123 bytes
SHA-256: `abb2ac642c7875ab222c5145fa4084e59d52160d799c318b8f0221dd931fbac9`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_08_off0008e091.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8E091	24123 bytes
SHA-256: `6140503219808684359c01ef538db94d8dce45c8df68704e5c9569e61031aa89`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_09_off0009f717.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9F717	24123 bytes
SHA-256: `7d4acefe1d66f3c065dc35e111ca34f9808337f091506ec88add7430cd812d55`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

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