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 6 IoCs

resource	yara_rule
behavioral1/files/0x000b000000012315-56.dat	family_isrstealer
behavioral1/files/0x000b000000012315-57.dat	family_isrstealer
behavioral1/files/0x000b000000012315-59.dat	family_isrstealer
behavioral1/files/0x000b000000012315-62.dat	family_isrstealer
behavioral1/files/0x000b000000012315-63.dat	family_isrstealer
behavioral1/files/0x000b000000012315-66.dat	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
1732	sd.exe
1240	sd.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1240-64-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1240-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1240-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1240-71-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1240-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Loads dropped DLL 3 IoCs

pid	Process
1960	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe
1960	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe
1732	sd.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 1732 set thread context of 1240	1732	sd.exe	29

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
1732	sd.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1732	1960	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	28
PID 1960 wrote to memory of 1732	1960	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	28
PID 1960 wrote to memory of 1732	1960	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	28
PID 1960 wrote to memory of 1732	1960	3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe	28
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29
PID 1732 wrote to memory of 1240	1732	sd.exe	29

C:\Users\Admin\AppData\Local\Temp\3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe
"C:\Users\Admin\AppData\Local\Temp\3e0fe0b4ebcb8a1f803b47bed8129987630c7ed559cd21e288a2b2c4ee5d5c59.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1960
- C:\Users\Admin\AppData\Local\Temp\sd.exe
  "C:\Users\Admin\AppData\Local\Temp\sd.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1732
- - C:\Users\Admin\AppData\Local\Temp\sd.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    - Executes dropped EXE
    PID:1240

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

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
\Users\Admin\AppData\Local\Temp\sd.exe

Filesize
196KB

MD5
fa70ff27070d0dc03d010db7fbeb847e

SHA1
5a77048a0eef073a1377422b91d6c4350f892135

SHA256
6e5f0bc3c597ea0545e5c2add09e1e8c3ba86ab1990a239a3a823b1a667251d3

SHA512
55555061724f6f5a01a9f41dad14b57148a868fcb55e3377176631ecb5d9c95a3133e3ddf63689ea721d3870d76fc2e69e971f7bc31657cc6000658d41adb140

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

Filesize
196KB

MD5
fa70ff27070d0dc03d010db7fbeb847e

SHA1
5a77048a0eef073a1377422b91d6c4350f892135

SHA256
6e5f0bc3c597ea0545e5c2add09e1e8c3ba86ab1990a239a3a823b1a667251d3

SHA512
55555061724f6f5a01a9f41dad14b57148a868fcb55e3377176631ecb5d9c95a3133e3ddf63689ea721d3870d76fc2e69e971f7bc31657cc6000658d41adb140

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

Filesize
196KB

MD5
fa70ff27070d0dc03d010db7fbeb847e

SHA1
5a77048a0eef073a1377422b91d6c4350f892135

SHA256
6e5f0bc3c597ea0545e5c2add09e1e8c3ba86ab1990a239a3a823b1a667251d3

SHA512
55555061724f6f5a01a9f41dad14b57148a868fcb55e3377176631ecb5d9c95a3133e3ddf63689ea721d3870d76fc2e69e971f7bc31657cc6000658d41adb140

Download Submit
memory/1240-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1240-64-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1240-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1240-71-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1240-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1960-55-0x0000000073E20000-0x00000000743CB000-memory.dmp

Filesize
5.7MB

Download
memory/1960-54-0x0000000074AB1000-0x0000000074AB3000-memory.dmp

Filesize
8KB

Download
memory/1960-73-0x0000000073E20000-0x00000000743CB000-memory.dmp

Filesize
5.7MB

Download

Analysis

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