RTF malware analysis — malicious · 941868f366d65c88

MALICIOUS

RTF

484.6 KB Created: 2018-01-10 09:47:00 Authoring application: Microsoft Word 11.0.5604 First seen: 2020-06-01

MD5: f8bbb28e84324eb4d72f8f852a5086d8 SHA-1: 815744ef39d3c337cdf31d41fd2399313c3f5ff3 SHA-256: 941868f366d65c8859253c869e405c5bbb91e1ed0227090656295c54bb0be9f2

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document that contains an embedded OLE object exploiting the Equation Editor vulnerability CVE-2017-11882. This exploit is known to download and execute a second-stage payload. The presence of ClamAV detection for Rtf.Exploit.CVE_2018_0802-6624871-1 further confirms its malicious nature. The document body content about coffee production appears to be a lure to disguise the malicious nature of the file.

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_off0001bbc4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BBC4	182000 bytes
SHA-256: `b12348420523509ce62157b562b81e637223d3d8e9e935e7a046fdaffdaaae58`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off000749f4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x749F4	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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