isrstealer | b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6

General

Target

b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe
Size

92KB
MD5

32d0b612ac8f4f9f7a4e9a431fbae676
SHA1

f90925f4acef4ba82b978abaae0ded81f3831cee
SHA256

b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6
SHA512

e8227e6dde000a5c1c2a580956df7478f48cea3949e0b88fd0e4952ab97cccc38a71f72c2b41566ec77193096ec9c0350d77c722d1b01ded0456efefaa38f7d7
SSDEEP

1536:8ml2Qr2U692jh5XBpxWJzq3YnoHA7uL3oFlY75Lslh:8mlqGhnWV8CjuTEY7hyh

Score

10^/10

isrstealer spyware 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
behavioral1/memory/272-60-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/272-61-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/272-62-0x00000000004011F0-mapping.dmp	family_isrstealer
behavioral1/memory/272-69-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/272-70-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Executes dropped EXE 1 IoCs

pid	Process
272	cvtres.exe

Loads dropped DLL 1 IoCs

pid	Process
2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2004 set thread context of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28

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

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349	cvtres.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	cvtres.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	cvtres.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
272	cvtres.exe
272	cvtres.exe
272	cvtres.exe
272	cvtres.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
272	cvtres.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28
PID 2004 wrote to memory of 272	2004	b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe	28

C:\Users\Admin\AppData\Local\Temp\b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe
"C:\Users\Admin\AppData\Local\Temp\b73b8583d9025b56793b1bc3128ad07abcdccfcc6f8084aff9dec84bd30b0eb6.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2004
- C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  2⤵
  - Executes dropped EXE
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:272

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Install Root Certificate

Modify Registry

Credential Access

Credentials in Files

2

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

Download Submit
memory/272-57-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/272-58-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/272-60-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/272-61-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/272-69-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/272-70-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2004-54-0x0000000075811000-0x0000000075813000-memory.dmp

Filesize
8KB

Download
memory/2004-55-0x0000000074110000-0x00000000746BB000-memory.dmp

Filesize
5.7MB

Download
memory/2004-65-0x0000000074110000-0x00000000746BB000-memory.dmp

Filesize
5.7MB

Download

Analysis

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