Concrete signature match: Trojan - Appears legitimate but performs malicious actions for 32-bit Windows platform, family CryptBot
Trojan:Win32/CryptBot.DB!MTB is an information-stealing trojan designed to steal sensitive data from infected systems. It targets cryptocurrency wallets (wallet.dat), browser credentials (logins.json, Passwords.txt), and session cookies, and takes screenshots for exfiltration to an attacker.
Relevant strings associated with this threat: - wallet.datd (PEHSTR_EXT) - logins.jsond (PEHSTR_EXT) - cookies.sqlited (PEHSTR_EXT) - Passwords.txtd (PEHSTR_EXT) - Screen.jpg (PEHSTR_EXT) - Comodo (PEHSTR_EXT)
rule Trojan_Win32_CryptBot_DB_2147938205_0
{
meta:
author = "threatcheck.sh"
detection_name = "Trojan:Win32/CryptBot.DB!MTB"
threat_id = "2147938205"
type = "Trojan"
platform = "Win32: Windows 32-bit platform"
family = "CryptBot"
severity = "Critical"
info = "MTB: Microsoft Threat Behavior"
signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
threshold = "403"
strings_accuracy = "High"
strings:
$x_100_1 = "wallet.dat" ascii //weight: 100
$x_100_2 = "logins.json" ascii //weight: 100
$x_100_3 = "cookies.sqlite" ascii //weight: 100
$x_100_4 = "Passwords.txt" ascii //weight: 100
$x_100_5 = "Screen.jpg" ascii //weight: 100
$x_1_6 = "Vivaldi" ascii //weight: 1
$x_1_7 = "Torch" ascii //weight: 1
$x_1_8 = "brave" ascii //weight: 1
$x_1_9 = "Slimjet" ascii //weight: 1
$x_1_10 = "CentBrowser" ascii //weight: 1
$x_1_11 = "Comodo" ascii //weight: 1
$x_1_12 = "CocCoc" ascii //weight: 1
$x_1_13 = "Google" ascii //weight: 1
$x_1_14 = "360Chrome" ascii //weight: 1
$x_1_15 = "Opera" ascii //weight: 1
$x_1_16 = "Chromium" ascii //weight: 1
condition:
(filesize < 20MB) and
(
((4 of ($x_100_*) and 3 of ($x_1_*))) or
((5 of ($x_100_*))) or
(all of ($x*))
)
}88feadbb2f9548d3c0cb9c6519bcea476acf9ac2a3eeccde5655457cbba29db4Immediately disconnect the device from the network to prevent data theft. Run a full antivirus scan to remove the threat; consider reimaging the system from a clean backup. Change all passwords for online accounts, move cryptocurrency funds to a new secure wallet, and enable multi-factor authentication on all critical services.