RTF malware analysis — malicious · c67625e2b5e2f01b

MALICIOUS

RTF

316.0 KB Created: 2017-12-08 20:50:00 First seen: 2020-06-01

MD5: 392f48d32de4cac9949ab7ecab393ba8 SHA-1: 5f197c15bbddcf2f77583f95bdc7e95415fc43a3 SHA-256: c67625e2b5e2f01b74e854c0c1fdf0b3b4733885475fe35b80a5f4bca13eccc7

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 the CVE-2017-11882 vulnerability in the Equation Editor. This exploit allows for arbitrary code execution upon opening the document. The presence of shellcode candidates in extracted artifacts further supports this attack vector. The document body content appears benign, suggesting the exploit is the primary malicious function.

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_2018_0802-6624871-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
\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_off0000891b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x891B	134896 bytes
SHA-256: `5f81196522be1053ac6d32982a4e30f2307da364970cdc5268c4dde27a99b232`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0004a74b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4A74B	9259 bytes
SHA-256: `fc77889c4d6682c34d7804173535b01aa023e3e2f0f13a8537b00f90a90c23de`
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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