isrstealer | 011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7

Analysis

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

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
27-09-2024 11:10

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General

Target

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
Size

737KB
MD5

8ea5e38acebe9b835f9b330faa8d6560
SHA1

d3473c0c7fd2b8d85104f0d6b5560cd8487177af
SHA256

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7
SHA512

cd0fab7d46856e7504a9f5dc1528177a2bc79e26ad0f12ecb9e860f524c4cc2ef40f5ac8d28d2f50169242f7fa8ad2a12fe090950c835906ce4976ff6b363e58
SSDEEP

6144:SgxilHZyojpSVOfkNvR/XwSFXHw5sKxGhjuZxerwfJcWVPwt+Verd1cIJYvvmW:6lYkCRv5FX8sKxGhyyk6TcIJYvvmW

Score

10^/10

isrstealer collection discovery persistence 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 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1944-45-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1944-46-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

Detected Nirsoft tools 1 IoCs

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

Processes:

resource	yara_rule
behavioral1/memory/3048-62-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral1/memory/3048-62-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Executes dropped EXE 4 IoCs

Processes:

app.exeapp.exeapp.exeapp.exe

pid	Process
2996	app.exe
1944	app.exe
1664	app.exe
3048	app.exe

Loads dropped DLL 1 IoCs

Processes:

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe

pid	Process
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.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

Processes:

app.exe

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	app.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\Application = "C:\\Users\\Admin\\AppData\\Roaming\\app.exe"	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

app.exeapp.exe

description	pid	Process	procid_target
PID 2996 set thread context of 1944	2996	app.exe	32
PID 1944 set thread context of 1664	1944	app.exe	33
PID 1944 set thread context of 3048	1944	app.exe	36

UPX packed file 6 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/1664-55-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1664-56-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1664-53-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/3048-59-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/3048-61-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/3048-62-0x0000000000400000-0x000000000041F000-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

Processes:

app.exeapp.exe011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exeapp.exeapp.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

Processes:

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exeapp.exe

pid	Process
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2996	app.exe
2996	app.exe
2996	app.exe
2996	app.exe
2996	app.exe
2996	app.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exeapp.exe

description	pid	Process
Token: SeDebugPrivilege	2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
Token: SeDebugPrivilege	2996	app.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

app.exe

pid	Process
1944	app.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exeapp.exeapp.exe

description	pid	Process	procid_target
PID 2120 wrote to memory of 2996	2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	31
PID 2120 wrote to memory of 2996	2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	31
PID 2120 wrote to memory of 2996	2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	31
PID 2120 wrote to memory of 2996	2120	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	31
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 2996 wrote to memory of 1944	2996	app.exe	32
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 1664	1944	app.exe	33
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36
PID 1944 wrote to memory of 3048	1944	app.exe	36

C:\Users\Admin\AppData\Local\Temp\011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
"C:\Users\Admin\AppData\Local\Temp\011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2120
- C:\Users\Admin\AppData\Roaming\app.exe
  "C:\Users\Admin\AppData\Roaming\app.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2996
- - C:\Users\Admin\AppData\Roaming\app.exe
    "C:\Users\Admin\AppData\Roaming\app.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1944
  - - C:\Users\Admin\AppData\Roaming\app.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\o33KKmFlDq.ini"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:1664
  - - C:\Users\Admin\AppData\Roaming\app.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\KM96RJiTRC.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:3048

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

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\Cab4AB6.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\o33KKmFlDq.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
742KB

MD5
2b9e9796b9caca75df98a607ea8c45ae

SHA1
7debc5ea30ecea6962996c4bdc3f4ec56222f8f4

SHA256
666bac0b2419592c1cfdda65baf3baf111cfe4e080a103ee6833140bf4e290d7

SHA512
07e47354acdc79f290bcc267281b3656cc2e5d9e80705cf95837c1fbeea3d5eb3f48cf560515a142b7248d731f702d1518c692bb2ef19f7dba7902b120ea5cfb

Download Submit
memory/1664-55-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1664-53-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1664-56-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1944-45-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1944-46-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2120-10-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2120-11-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2120-12-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2120-30-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2120-2-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2120-1-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2120-0-0x0000000074EE1000-0x0000000074EE2000-memory.dmp

Filesize
4KB

Download
memory/2996-31-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2996-50-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2996-43-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2996-42-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/2996-32-0x0000000074EE0000-0x000000007548B000-memory.dmp

Filesize
5.7MB

Download
memory/3048-59-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3048-61-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3048-62-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download