limerat | ae305f441faf08f439a302b56ca00e7426160af15ca532dd1936e38f803fa286

General

Target

MailUpdate.exe
Size

69KB
MD5

37d1bc1bd7eeb6b549d265db4a56da20
SHA1

a93c42ade354b2a706450715deacdec728e898a9
SHA256

ae305f441faf08f439a302b56ca00e7426160af15ca532dd1936e38f803fa286
SHA512

21431f94b29cc7786c77da61d1f1e9ab51f1676ab383d679a52ff10db3ca27a3fe1c73ccf879de1c28d9e8a120578bba98af840cb3b32bffd2d325001188212f
SSDEEP

1536:OpgFwa5ttd8yfeUzIasLQxFm5gUWd+0LDyjofAWZgzR:8Iwa7bZfRaQzm9FIDyjoY5V

Score

10^/10

limerat discovery rat

Malware Config

Extracted

Family

limerat

Wallets

bc1qyej3qhu680rqc5akxac39r92g6a8g6r4708gyj

Attributes

aes_key
Test
antivm
true
c2_url
https://pastebin.com/raw/UPe1Arqg
delay
3
download_payload
false
install
true
install_name
system32s.exe
main_folder
AppData
pin_spread
true
sub_folder
\
usb_spread
true

Extracted

Family

limerat

Attributes

antivm
false
c2_url
https://pastebin.com/raw/UPe1Arqg
download_payload
false
install
false
pin_spread
false
usb_spread
false

Signatures

LimeRAT
Simple yet powerful RAT for Windows machines written in .NET.
rat limerat

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:

MailUpdate.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	MailUpdate.exe

Executes dropped EXE 1 IoCs

Processes:

system32s.exe

pid process

1116 system32s.exe
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

34 pastebin.com
30 pastebin.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1116	system32s.exe

flow	ioc
34	pastebin.com
30	pastebin.com

System Location Discovery: System Language Discovery 1 TTPs 3 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

Processes:

schtasks.exesystem32s.exeMailUpdate.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	system32s.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MailUpdate.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

Processes:

schtasks.exe

pid process

4112 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

system32s.exe

description pid process

Token: SeDebugPrivilege 1116 system32s.exe
Token: SeDebugPrivilege 1116 system32s.exe

pid	process
4112	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1116	system32s.exe
Token: SeDebugPrivilege	1116	system32s.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

MailUpdate.exe

description	pid	process	target process
PID 1020 wrote to memory of 4112	1020	MailUpdate.exe	schtasks.exe
PID 1020 wrote to memory of 4112	1020	MailUpdate.exe	schtasks.exe
PID 1020 wrote to memory of 4112	1020	MailUpdate.exe	schtasks.exe
PID 1020 wrote to memory of 1116	1020	MailUpdate.exe	system32s.exe
PID 1020 wrote to memory of 1116	1020	MailUpdate.exe	system32s.exe
PID 1020 wrote to memory of 1116	1020	MailUpdate.exe	system32s.exe

C:\Users\Admin\AppData\Local\Temp\MailUpdate.exe
"C:\Users\Admin\AppData\Local\Temp\MailUpdate.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1020
- C:\Windows\SysWOW64\schtasks.exe
  schtasks /create /f /sc ONLOGON /RL HIGHEST /tn LimeRAT-Admin /tr "'C:\Users\Admin\AppData\Roaming\system32s.exe'"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4112
- C:\Users\Admin\AppData\Roaming\system32s.exe
  "C:\Users\Admin\AppData\Roaming\system32s.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:1116

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3996,i,1729213506309163284,12809566808978835441,262144 --variations-seed-version --mojo-platform-channel-handle=4340 /prefetch:8
1⤵
PID:1072

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\system32s.exe

Filesize
69KB

MD5
37d1bc1bd7eeb6b549d265db4a56da20

SHA1
a93c42ade354b2a706450715deacdec728e898a9

SHA256
ae305f441faf08f439a302b56ca00e7426160af15ca532dd1936e38f803fa286

SHA512
21431f94b29cc7786c77da61d1f1e9ab51f1676ab383d679a52ff10db3ca27a3fe1c73ccf879de1c28d9e8a120578bba98af840cb3b32bffd2d325001188212f

Download Submit
memory/1020-3-0x0000000005350000-0x00000000053B6000-memory.dmp

Filesize
408KB

Download
memory/1020-2-0x0000000005250000-0x00000000052EC000-memory.dmp

Filesize
624KB

Download
memory/1020-0-0x00000000750CE000-0x00000000750CF000-memory.dmp

Filesize
4KB

Download
memory/1020-4-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1020-5-0x0000000005F10000-0x00000000064B4000-memory.dmp

Filesize
5.6MB

Download
memory/1020-1-0x0000000000860000-0x0000000000878000-memory.dmp

Filesize
96KB

Download
memory/1020-16-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1116-15-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1116-17-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1116-18-0x0000000006B60000-0x0000000006BF2000-memory.dmp

Filesize
584KB

Download
memory/1116-19-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1116-20-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads