isrstealer | ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251

General

Target

ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
Size

591KB
MD5

c18562474f24706670e0885df66c05e3
SHA1

599c4cf063d1c7253fc7e96879356a5eeea75907
SHA256

ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251
SHA512

516c89b1082a3daef36f7c634699c18152fe612c99ff6360042917af220227edbaeafa2fd797e6de107c7e392000672fae2f711d6cc9cd35822d12bb1c4cdb50
SSDEEP

12288:Cv+dNIpYv6qGVegup6kNlhyKklCfyBMVA+7YJ+/UvC7YeTVth:5mO6qIup6kBUzh7QscL

Score

10^/10

isrstealer persistence spyware 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 5 IoCs

resource	yara_rule
behavioral1/memory/764-60-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/764-62-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/764-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/764-77-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/764-82-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
764	csrss.exe
1644	csrss.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1644-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1644-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1644-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1644-78-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1644-80-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Loads dropped DLL 2 IoCs

pid	Process
1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
764	csrss.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Live = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe"	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1624 set thread context of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 764 set thread context of 1644	764	csrss.exe	29

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
Token: SeDebugPrivilege	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
764	csrss.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 1624 wrote to memory of 764	1624	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	28
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29
PID 764 wrote to memory of 1644	764	csrss.exe	29

C:\Users\Admin\AppData\Local\Temp\ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
"C:\Users\Admin\AppData\Local\Temp\ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1624
- C:\Users\Admin\AppData\Local\Temp\csrss.exe
  C:\Users\Admin\AppData\Local\Temp\\csrss.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:764
- - C:\Users\Admin\AppData\Local\Temp\csrss.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\e9wAN0VE5K.ini"
    3⤵
    - Executes dropped EXE
    PID:1644

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

Download Submit
C:\Users\Admin\AppData\Local\Temp\e9wAN0VE5K.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
\Users\Admin\AppData\Local\Temp\csrss.exe

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

Download Submit
\Users\Admin\AppData\Local\Temp\csrss.exe

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

Download Submit
memory/764-60-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/764-77-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/764-62-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/764-82-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/764-58-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/764-57-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1624-79-0x0000000074F50000-0x00000000754FB000-memory.dmp

Filesize
5.7MB

Download
memory/1624-55-0x0000000074F50000-0x00000000754FB000-memory.dmp

Filesize
5.7MB

Download
memory/1624-54-0x00000000767D1000-0x00000000767D3000-memory.dmp

Filesize
8KB

Download
memory/1644-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1644-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1644-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1644-78-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1644-80-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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