RTF malware analysis — malicious · 42162c495e835cdf

MALICIOUS

RTF

747.2 KB Created: 2018-03-27 09:30:00 Authoring application: Microsoft Word 11.0.5604 First seen: 2019-11-20

MD5: d64161db327f4ec91d458a00293c62b0 SHA-1: 364570ca28e004bed1d9d4e5853befd77b88465f SHA-256: 42162c495e835cdf28670661a53d47d12255d9c791c1c5653673b25fb587ffed

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects, specifically triggering critical heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for client-side execution. The ClamAV detection further confirms its malicious nature, identifying it as Rtf.Exploit.CVE_2018_0802. The document body appears to be a legitimate Vietnamese government planning document, likely used as a lure.

Heuristics 8

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000305e8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x305E8	273648 bytes
SHA-256: `f2617a243fd20ac4356d059a880f321b6e3ba3dbc70e3324c1d8fe05d9bd1c3a`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off000b5ffe.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB5FFE	9781 bytes
SHA-256: `20f8b7ac964442c1266cca393e812ee31197416f72cdd9335aa9f521a415db00`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, SC_STR_VIRTUALPROTECT Static shellcode analysis recovered API/import strings: VirtualAlloc, VirtualAllocEx, VirtualProtect, VirtualProtectEx, WriteProcessMemory, ReadProcessMemory
`objdata_02_off000b6010.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB6010	35 bytes
SHA-256: `1188b98b21f50564ab8b476f25b6deab999a2f58a56c4dd0daa0f5883cfa941d`

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