user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Backdoor:Win32/Berbew
Backdoor:Win32/Berbew - Windows Defender threat signature analysis

Backdoor:Win32/Berbew - Windows Defender Threat Analysis

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

Concrete signature match: Backdoor - Provides unauthorized remote access for 32-bit Windows platform, family Berbew

Summary:

Backdoor:Win32/Berbew is a trojan that provides attackers with remote control over a compromised system. It establishes persistence through methods like scheduled tasks and startup folders, and utilizes hooking techniques to intercept system functions, likely for stealing credentials or other sensitive data.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - io\Programas\Inicio\ (PEHSTR_EXT)
 - \WINME\M (PEHSTR_EXT)
 - dLLl (SNID)
 - /'\R. (SNID)
 - WinExec (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 Backdoor_Win32_Berbew_B_2147594707_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Win32/Berbew.gen!B"
        threat_id = "2147594707"
        type = "Backdoor"
        platform = "Win32: Windows 32-bit platform"
        family = "Berbew"
        severity = "Critical"
        info = "gen: malware that is detected using a generic signature"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "8"
        strings_accuracy = "High"
    strings:
        $x_2_1 = {70 64 33 32 00 00 00 00 42 6c 61 63 6b 64 00 00 42 6c 61 63 6b 69 63 65 00 00 00 00 43 66 69 61}  //weight: 2, accuracy: High
        $x_2_2 = {57 66 69 6e 64 76 33 32 00 00 00 00 5a 6f 6e 65 61 6c 61 72 6d 00 00 00 6d 73 62 6c 61 73 74 00}  //weight: 2, accuracy: High
        $x_2_3 = {69 6f 5c 50 72 6f 67 72 61 6d 61 73 5c 49 6e 69 63 69 6f 5c 00 00 00 00 5c 57 49 4e 4d 45 5c 4d}  //weight: 2, accuracy: High
        $x_2_4 = {4e 49 43 4b 20 25 73 0a 55 53 45 52 20 25 73 20}  //weight: 2, accuracy: High
        $x_2_5 = {73 74 61 72 74 0d 0a 69 66 20 6e 6f 74 20 65 78 69 73 74 20 22 22 25 2a 22 22 20 67 6f 74 6f 20}  //weight: 2, accuracy: High
    condition:
        (filesize < 20MB) and
        (4 of ($x*))
}
Known malware which is associated with this threat:
Filename: i
10d9050fd2cce094214ce2fecc244ec6c2d06479a2f64f0567a80c01b995e384
19/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected machine from the network to prevent further malicious activity. Use your security software to remove the detected threat. Due to the backdoor nature, conduct a full investigation for persistence mechanisms, reset all user credentials on the system, and consider reimaging the machine to ensure complete eradication.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 19/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊