RTF malware analysis — malicious · 8f81142a9482c2a9

MALICIOUS

RTF

433.4 KB Created: 2018-01-31 11:24:00 Authoring application: Microsoft Word 11.0.5604 First seen: 2020-02-04

MD5: 45a94b3b13101c932a72d89ff5eb715a SHA-1: 5311b3ac4d54a2fa4f6b1320bfde90acfde40524 SHA-256: 8f81142a9482c2a96c43c4b325f90794c2a32b61e8261da55f306a36df9ec18c

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 exploiting CVE-2017-11882 through the Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. The ClamAV detection signature further confirms the exploit. The document body appears to be a report on economic and social development, likely a lure to entice the user to open the malicious attachment.

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
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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.
Package object class high RTF_OBJCLASS_PACKAGE

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

RTF contains 2 \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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000072df.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x72DF	197360 bytes
SHA-256: `8174c0c109bd8ec1c8ab7ef4ff93ac03dd5da032dd496270af1e9d842ffa803f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0006790f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6790F	9771 bytes
SHA-256: `ee6ee2d602694381b08b40228e2925b53dcf051fcd7f3d05b6596bb61bd6f02a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: NOP sled, SC_GETPC_CALL, SC_STR_VIRTUALPROTECT Static shellcode analysis recovered API/import strings: VirtualAlloc, VirtualAllocEx, VirtualProtect, VirtualProtectEx, WriteProcessMemory, ReadProcessMemory

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