LokiBot RTF malware analysis — malicious · c650d2c6770695dc

MALICIOUS

RTF

1002.3 KB Authoring application: Riched20 6.3.9600 First seen: 2018-10-07

MD5: 94af48e24e66d211b2b5117afe58f937 SHA-1: 629f0137534f0fa4b5095df5c8ac453885bb441b SHA-256: c650d2c6770695dc6bc3c7513c10fc9ee285757570f0569952c58504f805ace0

520 Risk Score

Malware Insights

LokiBot · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects, specifically exploiting the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. Static analysis detected a PE header within the hex-encoded data, indicating a packed or obfuscated payload. ClamAV identified the file as Win.Dropper.LokiBot, suggesting its purpose is to download and execute further malicious components.

Heuristics 11

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: Win.Malware.Autoit-6991398-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Malware.Autoit-6991398-1
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
\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
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1009KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ef.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF	504718 bytes
SHA-256: `60a0149869c22a93af24c508af39ff4ebc2db96d467c33275e9e69fa8335b549`
Detection ClamAV: Win.Malware.Autoit-6991398-1 Obfuscation or payload: likely Carved artifact entropy is 7.91, consistent with packed or encrypted content.
`objdata_01_off000f685a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF685A	3980 bytes
SHA-256: `061acd45512cd86d9317bb3f8eb7eda1cff514a90a1894dc30fd66edf7957d23`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\kroos.exe &��D$,f-Q��%
`objdata_02_off000f8aa0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF8AA0	3546 bytes
SHA-256: `22acdc0f0dd0c9ea84917853e9f1e2872840c91b6b254ffd90213b45f57b5fd1`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\kroos.exe AC

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