RTF malware analysis — malicious · bd1e7b42a9c26526

MALICIOUS

RTF

440.1 KB Created: 2018-01-17 09:09:00 Authoring application: Microsoft Word 11.0.5604 First seen: 2020-06-01

MD5: 07544892999b91ae2c9280d8ee3c663a SHA-1: 28531bcfaad25a5b1230f60f243ce617b6c237d2 SHA-256: bd1e7b42a9c265266b8cc5cc966470497c4f9cba2b247d1f036b6b3892106b52

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document that exploits CVE-2017-11882 via the Equation Editor component. This vulnerability allows for arbitrary code execution, which is a critical finding. The presence of OLE objects and extracted binary artifacts further supports the exploitation of this vulnerability. The document body discusses climate change projects in Vietnam, which appears to be a lure to disguise the malicious intent.

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_off00010980.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x10980	182000 bytes
SHA-256: `bf94954a4dbfa824696538b343eca54fcf7073cc63855b21cbf0fcc5d490492e`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off000697b0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x697B0	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

Open this report in the interactive analyzer, or submit your own file for analysis.