isrstealer | 1fbf779d7f1d4dfe9cd3f7c84c6e5763bb77530acc11732563e7abaeaba65a93

General

Target

c4d20a36d9f0e1ca758818b3be981779.exe
Size

606KB
MD5

c4d20a36d9f0e1ca758818b3be981779
SHA1

2d55fcb91c41aa7d63f240fc1c5a49c919cc4487
SHA256

1fbf779d7f1d4dfe9cd3f7c84c6e5763bb77530acc11732563e7abaeaba65a93
SHA512

e926955240c20b52d885a3471bd422cf0903e49260595419cdef1851676539b84379c1a6959a8ef9452352035f443052886d0a10c913da91824a0a0ae5e77ffe
SSDEEP

12288:DrVRbtxoNY4psjC6bswqW4jV//1iVs9odGn:DrFuJVMFMie9odO

Score

10^/10

isrstealer persistence 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 3 IoCs

resource	yara_rule
behavioral2/memory/2568-30-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/2568-36-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/2568-44-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	c4d20a36d9f0e1ca758818b3be981779.exe

Executes dropped EXE 4 IoCs

pid	Process
5000	tmp1.exe
2356	tmp2.exe
2568	tmp1.EXE
2168	tmp2.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
T1552.001
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
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RegEdit = "C:\\Users\\Admin\\AppData\\Roaming\\RegEdit.exe"	tmp2.EXE

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5000 set thread context of 2568	5000	tmp1.exe	92
PID 2356 set thread context of 2168	2356	tmp2.exe	93

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2568	tmp1.EXE
2568	tmp1.EXE
2568	tmp1.EXE
2568	tmp1.EXE
2568	tmp1.EXE
2568	tmp1.EXE
2568	tmp1.EXE
2568	tmp1.EXE

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
5032	c4d20a36d9f0e1ca758818b3be981779.exe
5000	tmp1.exe
2356	tmp2.exe
2568	tmp1.EXE

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 5032 wrote to memory of 5000	5032	c4d20a36d9f0e1ca758818b3be981779.exe	90
PID 5032 wrote to memory of 5000	5032	c4d20a36d9f0e1ca758818b3be981779.exe	90
PID 5032 wrote to memory of 5000	5032	c4d20a36d9f0e1ca758818b3be981779.exe	90
PID 5032 wrote to memory of 2356	5032	c4d20a36d9f0e1ca758818b3be981779.exe	91
PID 5032 wrote to memory of 2356	5032	c4d20a36d9f0e1ca758818b3be981779.exe	91
PID 5032 wrote to memory of 2356	5032	c4d20a36d9f0e1ca758818b3be981779.exe	91
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93
PID 5000 wrote to memory of 2568	5000	tmp1.exe	92
PID 2356 wrote to memory of 2168	2356	tmp2.exe	93

C:\Users\Admin\AppData\Local\Temp\c4d20a36d9f0e1ca758818b3be981779.exe
"C:\Users\Admin\AppData\Local\Temp\c4d20a36d9f0e1ca758818b3be981779.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5032
- C:\Users\Admin\AppData\Local\Temp\tmp1.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp1.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5000
- - C:\Users\Admin\AppData\Local\Temp\tmp1.EXE
    "C:\Users\Admin\AppData\Local\Temp\tmp1.EXE"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2568
- C:\Users\Admin\AppData\Local\Temp\tmp2.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp2.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2356
- - C:\Users\Admin\AppData\Local\Temp\tmp2.EXE
    "C:\Users\Admin\AppData\Local\Temp\tmp2.EXE"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    PID:2168

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp1.exe

Filesize
156KB

MD5
c1cfb778cbfe135b6fb0d2b6b9116b38

SHA1
f90af1a915f603a6acc40c18a5d9e8e6eef8d015

SHA256
b5d32c93e9a815f775489aa2b0ab1f86d45821df344916237746557062d7e8fb

SHA512
8ca72c995233c5c14eb9d1b6d6b1b70f72f03acbfb578743b0da8bce03b36d0d2d7e005feefb2fffd55f803e41f9e17b5be8ccc5a333a34d426545fbb6443b0a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp2.exe

Filesize
216KB

MD5
f0c93f442042bbbe985674d671191ed3

SHA1
a9ebbe67032eec48673b42325682859ce06a5e2c

SHA256
9708ceb9b7f76534315948101b2c8493d0c96e8205eee25e7b8a5473f65b997e

SHA512
7e8978c682d0e735f8f7bc16d1fb99136e927c7dc1d6e0fe5be41f0ec0808af9203bf146653f9fe4ac806c91f532144f5b27ac2b9adcb7b3876d4ab02a75e776

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp2.exe

Filesize
88KB

MD5
4eb6b67e77fa490b97926583d79d7e0d

SHA1
149e480b4fadfff351faac91f03a96a0382c2dc9

SHA256
6391f472e0b8866b4db818f2d13daf8beca8d77918d712dfc3307582d40e10d0

SHA512
2c49766d2ce7e693abfd25ddff14c3ae43af20d236d44ac4ffa4a332786c41d955c52ab1aac9593f03cd66f5c3c67850b13e62a4a27ad0b86647397dfab200f4

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp2.exe

Filesize
64KB

MD5
19be60d8ce45d71cba9166cc9000a265

SHA1
2d6ede4da37200698d51624605f7e8bbc05da363

SHA256
14b3e98b1bfbf89b2631741eb3c7116351dd08c52081b88519043c14a6f9b1c5

SHA512
cd615f665b7d3279bd5ede2bf0155593039ff3d69d948a2289a2baa2b17bb6ef451246385f5968b9a0329c34d25586768987de399d9073f168a5e40fcb2a2016

Download Submit
memory/2168-35-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2168-37-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2168-31-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2168-41-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2568-30-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2568-36-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2568-44-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/5032-0-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/5032-38-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads