isrstealer | 4939e272199eac93aeb81e063c368dcd228b59cbe82522e893b1d47badaf421e

Analysis

max time kernel
141s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
28/02/2025, 07:06

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General

Target

JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe
Size

1.5MB
MD5

325beb263217def7c4bd2bf3236e2f16
SHA1

c4f532eac3791f39952b3097a812b018237cad85
SHA256

4939e272199eac93aeb81e063c368dcd228b59cbe82522e893b1d47badaf421e
SHA512

a1a2347fe964c2884b4b9ddd560248550c12857e77f0d485aa0da900922d682770f6b505258f8a51d8cd2769b4bbf4f5eb2a225fbd9862ee08bffa1364972874
SSDEEP

24576:uHYxbvHwDr6Y/Hicgp/lUBuW6iefshRdrEAbm4z:u4xcD/6h0BuydYAm4z

Score

10^/10

isrstealer collection discovery 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 1 IoCs

resource	yara_rule
behavioral1/files/0x0008000000018683-36.dat	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 2 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral1/memory/1640-60-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1640-61-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1640-60-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1640-61-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Executes dropped EXE 5 IoCs

pid	Process
2568	keygen.exe
1944	sermini.exe
2888	Server.exe
2796	Server.exe
1640	Server.exe

Loads dropped DLL 4 IoCs

pid	Process
2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe
2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe
2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe
2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Server.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2888 set thread context of 2796	2888	Server.exe	33
PID 2888 set thread context of 1640	2888	Server.exe	36

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2796-44-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2796-43-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2796-42-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2796-40-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2796-47-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1640-57-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1640-60-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1640-59-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1640-61-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	keygen.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2568	keygen.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2888	Server.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2196 wrote to memory of 1944	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	30
PID 2196 wrote to memory of 1944	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	30
PID 2196 wrote to memory of 1944	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	30
PID 2196 wrote to memory of 1944	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	30
PID 2196 wrote to memory of 2568	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	31
PID 2196 wrote to memory of 2568	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	31
PID 2196 wrote to memory of 2568	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	31
PID 2196 wrote to memory of 2568	2196	JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe	31
PID 1944 wrote to memory of 2888	1944	sermini.exe	32
PID 1944 wrote to memory of 2888	1944	sermini.exe	32
PID 1944 wrote to memory of 2888	1944	sermini.exe	32
PID 1944 wrote to memory of 2888	1944	sermini.exe	32
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 2796	2888	Server.exe	33
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36
PID 2888 wrote to memory of 1640	2888	Server.exe	36

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_325beb263217def7c4bd2bf3236e2f16.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2196
- C:\Users\Admin\AppData\Local\Temp\sermini.exe
  "C:\Users\Admin\AppData\Local\Temp\sermini.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1944
- - C:\Users\Admin\AppData\Roaming\Server.exe
    "C:\Users\Admin\AppData\Roaming\Server.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2888
  - - C:\Users\Admin\AppData\Roaming\Server.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\DaDaIdRwQx.ini"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2796
  - - C:\Users\Admin\AppData\Roaming\Server.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\oNfloAEekj.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:1640
- C:\Users\Admin\AppData\Local\Temp\keygen.exe
  "C:\Users\Admin\AppData\Local\Temp\keygen.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: GetForegroundWindowSpam
  PID:2568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\DaDaIdRwQx.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
136KB

MD5
257b6fe60f7372701bc91dc83b2609a5

SHA1
417a75c5288dc120e4b887f0cddd14b6c27336a5

SHA256
e94be473fa9e08d386a08bba11f219e4ab730c112ca916d572726c26750f6b53

SHA512
0f465f4cebcee649b0ed2a864138d5d75242e828fb2c5cda0c2cc64f6d622bca3d4243d4ebcfc79ed677caa9e1f0062112bb9a59d7df550420fd3c12e5e81201

Download Submit
C:\Users\Admin\AppData\Roaming\Server.exe

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
memory/1640-57-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1640-61-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1640-59-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1640-60-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2196-21-0x00000000080D0000-0x00000000081A4000-memory.dmp

Filesize
848KB

Download
memory/2196-20-0x00000000080D0000-0x00000000081A4000-memory.dmp

Filesize
848KB

Download
memory/2196-2-0x0000000073CC0000-0x00000000743AE000-memory.dmp

Filesize
6.9MB

Download
memory/2196-1-0x0000000000040000-0x00000000001D0000-memory.dmp

Filesize
1.6MB

Download
memory/2196-53-0x00000000080D0000-0x00000000081A4000-memory.dmp

Filesize
848KB

Download
memory/2196-52-0x00000000080D0000-0x00000000081A4000-memory.dmp

Filesize
848KB

Download
memory/2196-0-0x0000000073CCE000-0x0000000073CCF000-memory.dmp

Filesize
4KB

Download
memory/2196-50-0x0000000073CC0000-0x00000000743AE000-memory.dmp

Filesize
6.9MB

Download
memory/2196-45-0x0000000073CCE000-0x0000000073CCF000-memory.dmp

Filesize
4KB

Download
memory/2568-51-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-63-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-75-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-74-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-73-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-72-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-54-0x0000000000401000-0x00000000004AF000-memory.dmp

Filesize
696KB

Download
memory/2568-55-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-56-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-29-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-22-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-24-0x0000000000401000-0x00000000004AF000-memory.dmp

Filesize
696KB

Download
memory/2568-25-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-71-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-64-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-65-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-66-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-67-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-68-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-69-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2568-70-0x0000000000400000-0x00000000004D3EA2-memory.dmp

Filesize
847KB

Download
memory/2796-47-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2796-44-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2796-43-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2796-42-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2796-40-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download