LokiBot RTF malware analysis — malicious · d98fc2535ed489eb

MALICIOUS

RTF

1.27 MB Authoring application: Riched20 6.3.9600 First seen: 2018-05-18

MD5: d86ccc01cfce647bdbb8e0e29fed2534 SHA-1: a99defbb78501798e595397b088a09c8bf811e1d SHA-256: d98fc2535ed489eb2070cb6290b6d6de31926d109aba793d194fba11dea6d7a4

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.Trojan.Ursu-6788339-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Ursu-6788339-1
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 ~1311KB 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	655582 bytes
SHA-256: `16b104402298ebfdaf08d6f23282b37d6fc9dc2b1801b70520f31d777cbcc4c0`
Detection ClamAV: Win.Trojan.Ursu-6788339-1 Obfuscation or payload: unlikely
`objdata_01_off001402fa.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1402FA	3980 bytes
SHA-256: `b2a6b27a694b993c933ef1f4bf270374fd8d55a932f85cf937a8581e296b4b56`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\Wanna.scr &��D$,f-Q��%
`objdata_02_off00142540.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x142540	3546 bytes
SHA-256: `e54221a8a926eb6a7f0e1b79dd0cd54a13a2b2c886e193ec1fee8bea8508f005`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\Wanna.scr AC

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