isrstealer | 3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59

General

Target

3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe
Size

285KB
MD5

904668932587d7dc853bea92906980b3
SHA1

287ebd3a54f7f4a44588c3ac3e9da8758f621cb9
SHA256

3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59
SHA512

5bc3a49d3018764922dd934c2a0045c13ab98bb197cc6075d07ddd819cc04dcf63bc7268f0cd58f022db87f7f5d662a398ca6e2120357ecf9db12cfcd8347a78
SSDEEP

6144:NpxIRFvpEihGQ70xENDb6VWSm3YFd/F5UB3COFslRx3EDlqx87QVv/vTf42340:nqRNwnENP6VW+FhvUBSvlR6Dle8M3rfl

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 3 IoCs

resource	yara_rule
behavioral2/files/0x000200000001e726-134.dat	family_isrstealer
behavioral2/files/0x000200000001e726-135.dat	family_isrstealer
behavioral2/files/0x000200000001e726-140.dat	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
208	sd.exe
1756	sd.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1756-139-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1756-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1756-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1756-144-0x0000000000400000-0x0000000000453000-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	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.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 1 IoCs

description	pid	Process	procid_target
PID 208 set thread context of 1756	208	sd.exe	82

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
208	sd.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1936 wrote to memory of 208	1936	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	81
PID 1936 wrote to memory of 208	1936	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	81
PID 1936 wrote to memory of 208	1936	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	81
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82
PID 208 wrote to memory of 1756	208	sd.exe	82

C:\Users\Admin\AppData\Local\Temp\3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe
"C:\Users\Admin\AppData\Local\Temp\3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1936
- C:\Users\Admin\AppData\Local\Temp\sd.exe
  "C:\Users\Admin\AppData\Local\Temp\sd.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:208
- - C:\Users\Admin\AppData\Local\Temp\sd.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    - Executes dropped EXE
    PID:1756

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\sd.exe

Filesize
196KB

MD5
fa70ff27070d0dc03d010db7fbeb847e

SHA1
5a77048a0eef073a1377422b91d6c4350f892135

SHA256
6e5f0bc3c597ea0545e5c2add09e1e8c3ba86ab1990a239a3a823b1a667251d3

SHA512
55555061724f6f5a01a9f41dad14b57148a868fcb55e3377176631ecb5d9c95a3133e3ddf63689ea721d3870d76fc2e69e971f7bc31657cc6000658d41adb140

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

Filesize
196KB

MD5
fa70ff27070d0dc03d010db7fbeb847e

SHA1
5a77048a0eef073a1377422b91d6c4350f892135

SHA256
6e5f0bc3c597ea0545e5c2add09e1e8c3ba86ab1990a239a3a823b1a667251d3

SHA512
55555061724f6f5a01a9f41dad14b57148a868fcb55e3377176631ecb5d9c95a3133e3ddf63689ea721d3870d76fc2e69e971f7bc31657cc6000658d41adb140

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

Filesize
196KB

MD5
fa70ff27070d0dc03d010db7fbeb847e

SHA1
5a77048a0eef073a1377422b91d6c4350f892135

SHA256
6e5f0bc3c597ea0545e5c2add09e1e8c3ba86ab1990a239a3a823b1a667251d3

SHA512
55555061724f6f5a01a9f41dad14b57148a868fcb55e3377176631ecb5d9c95a3133e3ddf63689ea721d3870d76fc2e69e971f7bc31657cc6000658d41adb140

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1756-139-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1756-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1756-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1756-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1936-132-0x00000000749B0000-0x0000000074F61000-memory.dmp

Filesize
5.7MB

Download
memory/1936-146-0x00000000749B0000-0x0000000074F61000-memory.dmp

Filesize
5.7MB

Download

Analysis

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