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 4 IoCs

resource	yara_rule
behavioral2/memory/4032-134-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4032-147-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4032-150-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4032-151-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
4032	csrss.exe
4092	csrss.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4092-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4092-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4092-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4092-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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-1-5-21-4246620582-653642754-1174164128-1000\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 1028 set thread context of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 4032 set thread context of 4092	4032	csrss.exe	85

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
Token: SeDebugPrivilege	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4032	csrss.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 1028 wrote to memory of 4032	1028	ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe	84
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85
PID 4032 wrote to memory of 4092	4032	csrss.exe	85

C:\Users\Admin\AppData\Local\Temp\ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe
"C:\Users\Admin\AppData\Local\Temp\ba4dc000d960320fa8d9668d26f4cd5c78bbd8e44ae04ae817584e456c92a251.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1028
- C:\Users\Admin\AppData\Local\Temp\csrss.exe
  C:\Users\Admin\AppData\Local\Temp\\csrss.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4032
- - C:\Users\Admin\AppData\Local\Temp\csrss.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\A3sQNhJ9LW.ini"
    3⤵
    - Executes dropped EXE
    PID:4092

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\A3sQNhJ9LW.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
memory/1028-148-0x0000000074CE0000-0x0000000075291000-memory.dmp

Filesize
5.7MB

Download
memory/1028-132-0x0000000074CE0000-0x0000000075291000-memory.dmp

Filesize
5.7MB

Download
memory/4032-134-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4032-147-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4032-150-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4032-151-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4092-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4092-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4092-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4092-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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