isrstealer | 1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894

General

Target

1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
Size

438KB
MD5

e1a72ac50663dc79c2b9a1307ebd7fb9
SHA1

a58bc72414ad4a1e93f4207ddc3ea895f069faf7
SHA256

1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894
SHA512

e62fc674e5b09304ccf0e0fdab317006ac13e85c62529c1d379113a70ade0d7ad113cc4dcb50ba6342429b4bb729ca2d1816dc9780adffafac3dd364f9088e40
SSDEEP

12288:lQVvdu+ATmOHEZER9vcndFhtOdJxe1Q3jjN:lQvAbTmOsM987tOR

Score

10^/10

isrstealer stealer trojan

Malware Config

Signatures

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

ISR Stealer payload 5 IoCs

resource	yara_rule
behavioral2/memory/4828-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4828-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4828-141-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4828-143-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4828-144-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1320 set thread context of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 4828 set thread context of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 set thread context of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 1320 wrote to memory of 4828	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	88
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 4828 wrote to memory of 0	4828	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
PID 1320 wrote to memory of 5092	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	89
PID 1320 wrote to memory of 5092	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	89
PID 1320 wrote to memory of 5092	1320	1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe	89

C:\Users\Admin\AppData\Local\Temp\1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
"C:\Users\Admin\AppData\Local\Temp\1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1320
- C:\Users\Admin\AppData\Local\Temp\1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe
  "C:\Users\Admin\AppData\Local\Temp\1b1e3084cc098dd5088caa23b8d96219d5d906c1d71a44e0a0a0f28858867894.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4828
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\takshost.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\takshost.exe"
  2⤵
  PID:5092

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/0-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/0-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1320-133-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/1320-146-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/1320-132-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/4828-141-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4828-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4828-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4828-143-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4828-144-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/5092-147-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/5092-148-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing