isrstealer | b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9

Analysis

max time kernel
45s
max time network
49s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
21-11-2022 23:29

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General

Target

b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9.exe
Size

360KB
MD5

5d0c3fed471d11d19e9dc10103bead3e
SHA1

865d8950c66519d206261926538e40073a252954
SHA256

b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9
SHA512

76285d896b45586660456b646910a822203325d57789abfb4619974620f18c370cdd9988331f8fe1283d0c16431d1c46aeae7e9fe2e55537d1ef7a041bac8f50
SSDEEP

6144:8xM8Skop7Dv+mmaX75j/12D3URRUAwDirJWjnc9gxuDFBHGFgiw:4cpHv+baX7n2QzUBDRjnc9ScFZG0

Score

10^/10

isrstealer collection persistence 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 5 IoCs

resource	yara_rule
behavioral1/memory/2036-65-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/2036-70-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/2036-72-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/2036-82-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/2036-91-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/824-89-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/824-90-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/824-92-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral1/memory/824-89-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/824-90-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/824-92-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 4 IoCs

pid	Process
964	winlogon.exe
2036	winlogon.exe
1864	winlogon.exe
824	winlogon.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/824-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/824-88-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/824-89-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/824-90-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/824-92-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	winlogon.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\Winlogon = "C:\\Users\\Admin\\AppData\\Roaming\\SubFolder\\SubFolder\\winlogon.exe"	winlogon.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Winlogon = "C:\\Users\\Admin\\AppData\\Roaming\\SubFolder\\SubFolder\\winlogon.exe"	winlogon.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 964 set thread context of 2036	964	winlogon.exe	28
PID 2036 set thread context of 1864	2036	winlogon.exe	29
PID 2036 set thread context of 824	2036	winlogon.exe	30

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
2036	winlogon.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 988 wrote to memory of 964	988	b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9.exe	27
PID 988 wrote to memory of 964	988	b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9.exe	27
PID 988 wrote to memory of 964	988	b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9.exe	27
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 964 wrote to memory of 2036	964	winlogon.exe	28
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 1864	2036	winlogon.exe	29
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30
PID 2036 wrote to memory of 824	2036	winlogon.exe	30

C:\Users\Admin\AppData\Local\Temp\b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9.exe
"C:\Users\Admin\AppData\Local\Temp\b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:988
- C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
  "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:964
- - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2036
  - - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\yREfiVS1nz.ini"
      4⤵
      Executes dropped EXE
      PID:1864
  - - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\1ZhryFMBP3.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:824

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe

Filesize
360KB

MD5
5d0c3fed471d11d19e9dc10103bead3e

SHA1
865d8950c66519d206261926538e40073a252954

SHA256
b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9

SHA512
76285d896b45586660456b646910a822203325d57789abfb4619974620f18c370cdd9988331f8fe1283d0c16431d1c46aeae7e9fe2e55537d1ef7a041bac8f50

Download Submit
C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe

Filesize
360KB

MD5
5d0c3fed471d11d19e9dc10103bead3e

SHA1
865d8950c66519d206261926538e40073a252954

SHA256
b3de5859d79cba761fb3f22ffb4f2c674452d4ddedc2732b9a1bc0fbed0926b9

SHA512
76285d896b45586660456b646910a822203325d57789abfb4619974620f18c370cdd9988331f8fe1283d0c16431d1c46aeae7e9fe2e55537d1ef7a041bac8f50

Download Submit
memory/824-88-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/824-87-0x0000000075021000-0x0000000075023000-memory.dmp

Filesize
8KB

Download
memory/824-89-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/824-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/824-90-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/824-92-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/964-60-0x000007FEF5030000-0x000007FEF5A53000-memory.dmp

Filesize
10.1MB

Download
memory/964-61-0x000007FEF2C00000-0x000007FEF3C96000-memory.dmp

Filesize
16.6MB

Download
memory/988-55-0x000007FEF2E70000-0x000007FEF3F06000-memory.dmp

Filesize
16.6MB

Download
memory/988-56-0x000007FEFBDE1000-0x000007FEFBDE3000-memory.dmp

Filesize
8KB

Download
memory/988-54-0x000007FEF4150000-0x000007FEF4B73000-memory.dmp

Filesize
10.1MB

Download
memory/2036-82-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2036-62-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2036-63-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2036-65-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2036-91-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2036-70-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download