RTF malware analysis — malicious · 38dbc7d46a1a9f5b

MALICIOUS

RTF

737.1 KB Created: 2018-04-27 01:11:00 First seen: 2019-09-30

MD5: 5b2e84e924cfaf0da3776f40bfffcd39 SHA-1: 29e39a7dd6d7704940450ca608ae17920183541b SHA-256: 38dbc7d46a1a9f5b481960352364502696e3d3a30ddc5aa6de8251ebacca1b0a

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_off00002c15.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C15	24123 bytes
SHA-256: `28773ef60c499ed49e3a3eed49934c01fb1d38e7bb9a4bad173caba08e4c5958`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_01_off0001429b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1429B	24123 bytes
SHA-256: `3fa4e689f2cdc3183a41004b7c36c8d3ded312b6acc7eb84a6ae8707ade63c92`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_02_off00025921.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25921	24123 bytes
SHA-256: `ef20e413b3bace6fb77a59742a8d8a45bf3238270a6ad2a09f3b09afc9a38593`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_03_off00036fa7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36FA7	24123 bytes
SHA-256: `e6420f0af42fef56adac0f9260d6dde767f3c64ce761876931bfe891981c0b22`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_04_off0004862d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4862D	24123 bytes
SHA-256: `6924de47e21a3baae73d1773f7f364cc4eaa680642ea1d56970e47b47fed888e`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_05_off00059cfd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x59CFD	24123 bytes
SHA-256: `a7bc620e4078d511e391ecf4b4d87355f3fa75dc5007d24c349e0eb2439bef9e`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_06_off0006b383.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6B383	24123 bytes
SHA-256: `9a786ef9b291d43184a321d73d521a1f4f510640c9a6539bdf33212b7e5f3ccd`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_07_off0007ca09.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7CA09	24123 bytes
SHA-256: `8b0dc9c7a9c06e20c763d4f0a96207b11c4c7f8fd7254579f40db7cd4c15b2c6`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_08_off0008e08f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8E08F	24123 bytes
SHA-256: `cf482d422388d0eb868be2e85db50c068e40701b359ec5a50b85994abdff9a33`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_09_off0009f715.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9F715	24123 bytes
SHA-256: `ac1ae04d7b3bd68c11b05be6f386c1a88e3390d3d268ab77465cc0c9be2c04ae`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

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