RTF malware analysis — malicious · 332aa26d719a20f3

MALICIOUS

RTF

506.8 KB Created: 2018-01-16 11:32:00 Authoring application: Microsoft Word 11.0.5604 First seen: 2019-11-20

MD5: 2eb3b85fb1f5c79879ee0e6623da4754 SHA-1: 6244f2da02466e8ebb7069a93a0018f8b8867464 SHA-256: 332aa26d719a20f3a26b2b00a9ca5d2e090b33f5070b057f4950d4f088201ab9

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing embedded OLE objects, specifically triggering critical heuristics for CVE-2017-11882 and CVE-2018-0802 via the Equation Editor. This indicates exploitation for client execution. The presence of suspicious extracted artifacts suggests the execution of shellcode, likely to download and run a secondary payload, aligning with a spearphishing attachment attack vector. No specific family could be identified.

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_off0001a473.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A473	196336 bytes
SHA-256: `d0a747ea28d56d348e4f0c6ff996b6fb0c569af9011ccaff4c76d6e300c2bb6e`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0007a2a3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7A2A3	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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