isrstealer | 56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817

Analysis

max time kernel
152s
max time network
171s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
26/11/2022, 13:22

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General

Target

56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe
Size

536KB
MD5

dcf1d09fadd3f5a019fe454bfb5421d4
SHA1

a9a16c7f7c1c5e6d30a5b18625874fae136a1ba3
SHA256

56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817
SHA512

e4d90fae0d1017052c05b44da9e42c6f323e01aaf3f650e8ff07cb9d352766a70910d77f88ef1e509f0dc9e615caabbeedc430e16e79286145059bc219860509
SSDEEP

12288:PvwVa5L9B/S5cCo4GgKUX/QgIVlFMPxC15J:Xw4lXCo4JnclFixC15

Score

10^/10

isrstealer stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/files/0x000b00000002171d-136.dat	family_isrstealer
behavioral2/files/0x000b00000002171d-137.dat	family_isrstealer
behavioral2/files/0x000b00000002171d-146.dat	family_isrstealer
behavioral2/files/0x000b00000002171d-152.dat	family_isrstealer

Executes dropped EXE 3 IoCs

pid	Process
524	Server.exe
5108	Server.exe
4092	Server.exe

UPX packed file 6 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/5108-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5108-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4092-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4092-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/5108-155-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4092-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 524 set thread context of 5108	524	Server.exe	83
PID 524 set thread context of 4092	524	Server.exe	85

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 3 IoCs

pid	pid_target	Process	procid_target
3848	1364	WerFault.exe	82
3304	4092	WerFault.exe	85
1772	5108	WerFault.exe	83

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe
524	Server.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1944 wrote to memory of 524	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	81
PID 1944 wrote to memory of 524	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	81
PID 1944 wrote to memory of 524	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	81
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 1944 wrote to memory of 1364	1944	56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe	82
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 5108	524	Server.exe	83
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85
PID 524 wrote to memory of 4092	524	Server.exe	85

C:\Users\Admin\AppData\Local\Temp\56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe
"C:\Users\Admin\AppData\Local\Temp\56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1944
- C:\Users\Admin\AppData\Local\Temp\Server.exe
  "C:\Users\Admin\AppData\Local\Temp\Server.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:524
- - C:\Users\Admin\AppData\Local\Temp\Server.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\rHDDZQECla.ini"
    3⤵
    - Executes dropped EXE
    PID:5108
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5108 -s 456
      4⤵
      Program crash
      PID:1772
- - C:\Users\Admin\AppData\Local\Temp\Server.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\hrsIpEdYg3.ini"
    3⤵
    - Executes dropped EXE
    PID:4092
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4092 -s 476
      4⤵
      Program crash
      PID:3304
- C:\Users\Admin\AppData\Local\Temp\56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe
  "C:\Users\Admin\AppData\Local\Temp\56d675b94ed40dcb422a2456ad30f60256b5dda9f1e20bc519bd58abd25ad817.exe"
  2⤵
  PID:1364
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1364 -s 304
    3⤵
    - Program crash
    PID:3848

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1364 -ip 1364
1⤵
PID:3904

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5108 -ip 5108
1⤵
PID:3296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4092 -ip 4092
1⤵
PID:1116

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Server.exe

Filesize
260KB

MD5
c7ef8d606bd77b572cafac7dd5ca3182

SHA1
5833675c484816f7da120f58e4476afba4975d66

SHA256
7a23077dbcc1310c135d32cb442bdac8cc2befbd3ab43a757e4c4ddd0641c398

SHA512
6087caa54bd79c463dfed45f67ef81d5535ad9362a48088e149a244f720e83a0464ebc72ef7706e10355b68d852c53b5db7a05d01c730012901eb3024982946a

Download Submit
C:\Users\Admin\AppData\Local\Temp\Server.exe

Filesize
260KB

MD5
c7ef8d606bd77b572cafac7dd5ca3182

SHA1
5833675c484816f7da120f58e4476afba4975d66

SHA256
7a23077dbcc1310c135d32cb442bdac8cc2befbd3ab43a757e4c4ddd0641c398

SHA512
6087caa54bd79c463dfed45f67ef81d5535ad9362a48088e149a244f720e83a0464ebc72ef7706e10355b68d852c53b5db7a05d01c730012901eb3024982946a

Download Submit
C:\Users\Admin\AppData\Local\Temp\Server.exe

Filesize
260KB

MD5
c7ef8d606bd77b572cafac7dd5ca3182

SHA1
5833675c484816f7da120f58e4476afba4975d66

SHA256
7a23077dbcc1310c135d32cb442bdac8cc2befbd3ab43a757e4c4ddd0641c398

SHA512
6087caa54bd79c463dfed45f67ef81d5535ad9362a48088e149a244f720e83a0464ebc72ef7706e10355b68d852c53b5db7a05d01c730012901eb3024982946a

Download Submit
C:\Users\Admin\AppData\Local\Temp\Server.exe

Filesize
260KB

MD5
c7ef8d606bd77b572cafac7dd5ca3182

SHA1
5833675c484816f7da120f58e4476afba4975d66

SHA256
7a23077dbcc1310c135d32cb442bdac8cc2befbd3ab43a757e4c4ddd0641c398

SHA512
6087caa54bd79c463dfed45f67ef81d5535ad9362a48088e149a244f720e83a0464ebc72ef7706e10355b68d852c53b5db7a05d01c730012901eb3024982946a

Download Submit
memory/1364-157-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1364-141-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1364-139-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1364-149-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1944-140-0x00000000007A0000-0x00000000007A6000-memory.dmp

Filesize
24KB

Download
memory/1944-134-0x00000000007A0000-0x00000000007A6000-memory.dmp

Filesize
24KB

Download
memory/4092-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4092-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4092-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5108-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5108-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5108-155-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download