TrueCrypt

TrueCrypt, a crypter developed and sold by the developers behind Meduza Stealer, which features LoadPE functionality and is written in Golang, supports both native (x32) and .NET binaries. This crypter has been used by Lumma, Vidar, Raccoon, MetaStealer, Redline stealers, and DCRAT.

Technique Identifier

U1432

Technique Tags

truecrypt packer

Evasion Categories

Packers

Detection Rules

rule TrueCrypt_crypter {
    meta:
        author = "RussianPanda"
        description = "Detects TrueCrypt crypter"
        date = "1/6/2024"
        hash = "167637397fb45ea19bafcf208d8f27dceec82caa7ab19d40ecdb08eb1b7d4f60"

    strings:
        $s1_crpt1 = {77 69 6E 65 5F 67 65 74}
        $s2_crpt1 = {49 3B 66 10 76}
        $s2_crpt2 = {3B 55 48 89 E5 48 83 EC 10 90 8B 0D [22] E8 [3] FF}
        $s3_crpt1 = {49 3B 66 10 76 43}
        $s3_crpt2 = {55 48 89 E5 48 83 EC 10 [5] E8 [4] 48 85 FF 75 18}
        $s4_crpt1 = {40 C0 EE 04 [16] 48 83}
        $s4_crpt2 = {FA 20 [0-22] 48 83 FE 20}
        $a_crpt = {61 2E 6F 75 74 2E 65 78 65 00 5F 63 67}
	$s_crpt = {6F 5F 64 75 6D 6D 79 5F 65 78 70 6F 72 74}

    condition: 
        uint16(0) == 0x5A4D 
        and $s1_crpt1
        and $s2_crpt1 and $s2_crpt2
        and $s3_crpt1 and $s3_crpt2
        and $s4_crpt1 and $s4_crpt2
        and $a_crpt and $s_crpt 
        and filesize < 7MB 
}

Contributor

RussianPanda

Additional Resources

External Links

The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.

https://www.resecurity.com/blog/article/new-version-of-medusa-stealer-released-in-dark-web

Created

January 7, 2024

Last Revised

March 24, 2026