LokiBot RTF malware analysis — malicious · cf8b55ecba496fbb

MALICIOUS

RTF

1.38 MB Authoring application: Riched20 6.3.9600 First seen: 2019-04-18

MD5: f24f89932507c2c5aeecee0a8d0f6276 SHA-1: 3067d8629a7b07ca29ab611579b0be9d9ee8c6a8 SHA-256: cf8b55ecba496fbb264a653fb32520f7bac7d1bd04838f9d3ba09a594dd7c28c

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.Dropper.LokiBot-9957036-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Dropper.LokiBot-9957036-0
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 ~1435KB 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	717507 bytes
SHA-256: `4afdb7ba5d822d95a4493b474e23da84d9bfa8d17a9bdcf3501b044f6978c338`
Detection ClamAV: Win.Dropper.LokiBot-9957036-0 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_MSF_REVERSE, SC_STR_VIRTUALALLOC, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: LoadLibraryExA, VirtualAlloc, GetProcAddress, ExitProcess, kernel32.dll, KERNEL32.DLL
`objdata_01_off0015e6c4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x15E6C4	3980 bytes
SHA-256: `709e7548187026e0fde55caafb5b7d8101194ce4f48136864fe15f750dc39678`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\69.exe &��D$,f-Q��%
`objdata_02_off0016090a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16090A	3546 bytes
SHA-256: `71e896096504b80659c0f5c60d79e09818a0128638e4b781a41f71c4dd3468aa`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\69.exe AC

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