user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win32/DarkCloud!AMTB
Trojan:Win32/DarkCloud!AMTB - Windows Defender threat signature analysis

Trojan:Win32/DarkCloud!AMTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win32/DarkCloud!AMTB
Classification:
Type:Trojan
Platform:Win32
Family:DarkCloud
Detection Type:Concrete
Known malware family with identified signatures
Suffix:!AMTB
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for 32-bit Windows platform, family DarkCloud

Summary:

Trojan:Win32/DarkCloud!AMTB is a concrete detection of a sophisticated infostealer designed to exfiltrate a broad range of sensitive user data. It targets browser credentials (passwords, credit cards), cryptocurrency wallet data (MetaMask), email client accounts (Thunderbird, Foxmail), and FTP/site manager credentials. The malware employs Windows utilities like mshta, regsvr32, rundll32, and BITS jobs for execution and persistence.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - sitemanager.xml (PEHSTR_EXT)
 - ===============DARKCLOUD=============== (PEHSTR_EXT)
 - ThunderBirdContacts.txt (PEHSTR_EXT)
 - MailContacts.txt (PEHSTR_EXT)
 - ==DARKCLOUD== (PEHSTR_EXT)
 - SOFTWARE\Classes\Foxmail.url.mailto\Shell\open\command (PEHSTR_EXT)
 - accounts.xml (PEHSTR_EXT)
 - apstoneProject2ndYear.Resources.resources (PEHSTR_EXT)
 - ChromeMetaMaskVaultData.txt (PEHSTR_EXT)
 - DARKCLOUD (PEHSTR_EXT)
 - )UPA_HELPER.Properties.Resources.resources (PEHSTR)
 - Confuser.Core (PEHSTR_EXT)
 - =C.z% (PEHSTR_EXT)
 - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT)
 - rundll32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForScheduledTask.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForDataEncoding.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.J!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.K!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteFileCopy.B!pli (PEHSTR_EXT)
 - !#HSTR:ExecutionGuardrails (PEHSTR_EXT)
 - !#HSTR:StringCodeForFileDeletion.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.M!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForNetshHelperDLL.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteServices.A!pli (PEHSTR_EXT)
YARA Rule:
rule Trojan_Win32_DarkCloud_AMTB_2147958526_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Win32/DarkCloud!AMTB"
        threat_id = "2147958526"
        type = "Trojan"
        platform = "Win32: Windows 32-bit platform"
        family = "DarkCloud"
        severity = "Critical"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "12"
        strings_accuracy = "High"
    strings:
        $x_2_1 = "\\User Data\\Default\\Login Data" ascii //weight: 2
        $x_2_2 = "Name on Card:" ascii //weight: 2
        $x_2_3 = "SELECT origin_url, username_value, password_value FROM logins" ascii //weight: 2
        $x_2_4 = "SELECT name_on_card, expiration_month, expiration_year, card_number_encrypted FROM credit_cards" ascii //weight: 2
        $x_2_5 = "SELECT hostname, encryptedUsername, encryptedPassword  FROM moz_logins" ascii //weight: 2
        $x_2_6 = "===============DARKCLOUD===============" ascii //weight: 2
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: PURCHASE ORDER.exe
306c682a2b48af83475bc34adb4e33c0cd7b3c796b562dcc24d71f9a49d54072
30/01/2026
→VirusTotal↓Download Sample
Filename: JCtrans Global Sea Freight 2026 Circular.exe
3ad521009837517bdafbba310233d18c12e00f7d94e2b01f4533f44a299243e4
08/01/2026
→VirusTotal↓Download Sample
Filename: PO 653 PDF.exe
77e8ad6d2d3029c151d872c289caf4e27cc5e6f95963c64f003553ccf57a7db0
27/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected system from the network and perform a full antivirus scan to remove the threat. Urgently reset all online account passwords (especially for email, banking, and cryptocurrency services) accessed from the compromised machine, and enable multi-factor authentication where available. Monitor financial accounts for suspicious activity.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 27/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊