isrstealer | 20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590

General

Target

20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
Size

768KB
MD5

709f31cce8fb596fb211ecb532ac3320
SHA1

0b4fd56473ade74d74d3831fe4674188a0623971
SHA256

20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590
SHA512

65fef446f3bbb1b1047f2537021977573eeb6d854a753e6c479035880022eef6164ad42535239acf4145411d533f5692d37e939bec7eaeea25a92beadbbae436
SSDEEP

6144:mgxilHZyojpSVOfkNvR/XwSFXHw5sKxGhjuZxerwfJcWVPwt+Verd1cIJYvvB:2lYkCRv5FX8sKxGhyyk6TcIJYvvB

Score

10^/10

isrstealer discovery persistence 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 2 IoCs

resource	yara_rule
behavioral2/memory/3152-37-0x0000000000810000-0x0000000000852000-memory.dmp	family_isrstealer
behavioral2/memory/3152-36-0x0000000000810000-0x0000000000852000-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-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe

Executes dropped EXE 2 IoCs

pid	Process
1524	app.exe
3152	app.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Application = "C:\\Users\\Admin\\AppData\\Roaming\\app.exe"	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1524 set thread context of 3152	1524	app.exe	92

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
1524	app.exe
1524	app.exe
1524	app.exe
1524	app.exe
1524	app.exe
1524	app.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
Token: SeDebugPrivilege	1524	app.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4960 wrote to memory of 1524	4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe	91
PID 4960 wrote to memory of 1524	4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe	91
PID 4960 wrote to memory of 1524	4960	20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe	91
PID 1524 wrote to memory of 3152	1524	app.exe	92
PID 1524 wrote to memory of 3152	1524	app.exe	92
PID 1524 wrote to memory of 3152	1524	app.exe	92
PID 1524 wrote to memory of 3152	1524	app.exe	92
PID 1524 wrote to memory of 3152	1524	app.exe	92
PID 1524 wrote to memory of 3152	1524	app.exe	92
PID 1524 wrote to memory of 3152	1524	app.exe	92

C:\Users\Admin\AppData\Local\Temp\20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe
"C:\Users\Admin\AppData\Local\Temp\20183e553792ae6197e8c687be18a66f742c03f7a4f056104352c01b43832590N.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4960
- C:\Users\Admin\AppData\Roaming\app.exe
  "C:\Users\Admin\AppData\Roaming\app.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1524
- - C:\Users\Admin\AppData\Roaming\app.exe
    "C:\Users\Admin\AppData\Roaming\app.exe"
    3⤵
    - Executes dropped EXE
    PID:3152

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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

Exfiltration

Impact

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Downloads

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

Filesize
777KB

MD5
d06a60abbfb3ced9c286012cfc42339f

SHA1
b9e25d650152196f96fb2a0681c9242da3237aa7

SHA256
9f2f4620137e9d6f80e27afd8a924ac0f36c036041ca29076678687251aef53f

SHA512
098c5bab493030ae75a6182cd600145384d0d534705326a19235b727f80222200cce8f4bc7f645bc0ffa4fbb372d47788e7b8fad92e07ffd1f28126f26881c43

Download Submit
memory/1524-30-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/1524-40-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/1524-34-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/1524-33-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/1524-32-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/3152-36-0x0000000000810000-0x0000000000852000-memory.dmp

Filesize
264KB

Download
memory/3152-37-0x0000000000810000-0x0000000000852000-memory.dmp

Filesize
264KB

Download
memory/4960-6-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/4960-31-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/4960-8-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/4960-7-0x00000000754B2000-0x00000000754B3000-memory.dmp

Filesize
4KB

Download
memory/4960-0-0x00000000754B2000-0x00000000754B3000-memory.dmp

Filesize
4KB

Download
memory/4960-5-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/4960-2-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download
memory/4960-1-0x00000000754B0000-0x0000000075A61000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads