isrstealer | 425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c

General

Target

425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe
Size

1.3MB
MD5

ce2efcc4baef5fed9b20ad44cf4bf716
SHA1

6b510ac7433d1cfe0c859b1cc36dbecfdd424619
SHA256

425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c
SHA512

01aa59a094d894df74e2aa9614d076326f1acfb6535107479375f4f8e626df6183291c4369d16190b7e6d6efc9a640b9f2b1d0d709d84c7890abedad2c573800
SSDEEP

24576:4lmdVcLgnDAUf5AMpcDJ2WVcvBcC4zj9f7rQieJsU9eZ3Sv:umUgnD3byDcuhQi6e

Score

10^/10

isrstealer 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/228-143-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/228-146-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/228-156-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/228-158-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 4 IoCs

pid	Process
3732	install.exe
4872	keygen.exe
228	install.exe
4980	install.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4980-150-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4980-153-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4980-154-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4980-155-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3732 set thread context of 228	3732	install.exe	84
PID 228 set thread context of 4980	228	install.exe	85

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
228	install.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 5064 wrote to memory of 3732	5064	425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe	80
PID 5064 wrote to memory of 3732	5064	425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe	80
PID 5064 wrote to memory of 3732	5064	425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe	80
PID 5064 wrote to memory of 4872	5064	425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe	81
PID 5064 wrote to memory of 4872	5064	425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe	81
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 3732 wrote to memory of 228	3732	install.exe	84
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85
PID 228 wrote to memory of 4980	228	install.exe	85

C:\Users\Admin\AppData\Local\Temp\425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe
"C:\Users\Admin\AppData\Local\Temp\425983cc82d0b23ad35586397a46ed5cba98af15a21d6266ddcf073006a9830c.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5064
- C:\Users\Admin\AppData\Local\Temp\install.exe
  "C:\Users\Admin\AppData\Local\Temp\install.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:3732
- - C:\Users\Admin\AppData\Local\Temp\install.exe
    C:\Users\Admin\AppData\Local\Temp\install.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:228
  - - C:\Users\Admin\AppData\Local\Temp\install.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\63XU5q3Srl.ini"
      4⤵
      Executes dropped EXE
      PID:4980
- C:\Users\Admin\AppData\Local\Temp\keygen.exe
  "C:\Users\Admin\AppData\Local\Temp\keygen.exe"
  2⤵
  - Executes dropped EXE
  PID:4872

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

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\63XU5q3Srl.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
583KB

MD5
4dbee433c083b0a761b18e49a5036bab

SHA1
fd1390641a2cb532b3548d3da883f81bf057c5b9

SHA256
8b1590bbe26ddb03f26232e14c7445c8a2ac0abcec8ff13ded9a6c6ebe487565

SHA512
6f809a8c993be6120ad85575ba783627bbfdbea2f8f9a49fca6566ef575762c3a203d5ec74746eea592da0df2343a264db6bef180623e345fd5ba4a476846f93

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

Filesize
583KB

MD5
4dbee433c083b0a761b18e49a5036bab

SHA1
fd1390641a2cb532b3548d3da883f81bf057c5b9

SHA256
8b1590bbe26ddb03f26232e14c7445c8a2ac0abcec8ff13ded9a6c6ebe487565

SHA512
6f809a8c993be6120ad85575ba783627bbfdbea2f8f9a49fca6566ef575762c3a203d5ec74746eea592da0df2343a264db6bef180623e345fd5ba4a476846f93

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

Filesize
583KB

MD5
4dbee433c083b0a761b18e49a5036bab

SHA1
fd1390641a2cb532b3548d3da883f81bf057c5b9

SHA256
8b1590bbe26ddb03f26232e14c7445c8a2ac0abcec8ff13ded9a6c6ebe487565

SHA512
6f809a8c993be6120ad85575ba783627bbfdbea2f8f9a49fca6566ef575762c3a203d5ec74746eea592da0df2343a264db6bef180623e345fd5ba4a476846f93

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

Filesize
583KB

MD5
4dbee433c083b0a761b18e49a5036bab

SHA1
fd1390641a2cb532b3548d3da883f81bf057c5b9

SHA256
8b1590bbe26ddb03f26232e14c7445c8a2ac0abcec8ff13ded9a6c6ebe487565

SHA512
6f809a8c993be6120ad85575ba783627bbfdbea2f8f9a49fca6566ef575762c3a203d5ec74746eea592da0df2343a264db6bef180623e345fd5ba4a476846f93

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

Filesize
357KB

MD5
4d8060b9e121f86e4205134fb0e0b629

SHA1
b43d2fd79767737a692dd8b37a64a714436e5fa0

SHA256
80e090798620727eb5eef8591baa5fdc4e769729390c71abf01e7a15334d0d49

SHA512
5b2dd91341818729d0c9e42f511708f4ea2027d3d26d194fdbb3066720595e95d510cda88ca7f6ec59ce7d8769c42965d372e8a17fe640bee9f5efc5179e9a28

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

Filesize
357KB

MD5
4d8060b9e121f86e4205134fb0e0b629

SHA1
b43d2fd79767737a692dd8b37a64a714436e5fa0

SHA256
80e090798620727eb5eef8591baa5fdc4e769729390c71abf01e7a15334d0d49

SHA512
5b2dd91341818729d0c9e42f511708f4ea2027d3d26d194fdbb3066720595e95d510cda88ca7f6ec59ce7d8769c42965d372e8a17fe640bee9f5efc5179e9a28

Download Submit
memory/228-158-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/228-156-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/228-146-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/228-143-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4872-141-0x00007FFCC19D0000-0x00007FFCC2491000-memory.dmp

Filesize
10.8MB

Download
memory/4872-140-0x00007FFCC19D0000-0x00007FFCC2491000-memory.dmp

Filesize
10.8MB

Download
memory/4872-139-0x0000000000020000-0x0000000000080000-memory.dmp

Filesize
384KB

Download
memory/4980-150-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4980-153-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4980-154-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4980-155-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5064-132-0x00007FFCC24A0000-0x00007FFCC2ED6000-memory.dmp

Filesize
10.2MB

Download

Analysis

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