isrstealer | 75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

Analysis

max time kernel
160s
max time network
46s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
23/11/2022, 15:33

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General

Target

75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe
Size

268KB
MD5

ba82b7b0ca3cda4d46bccf28099c0ce2
SHA1

c9139cf34974c7cdaa5a9758c8a08e65e39aac26
SHA256

75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca
SHA512

dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57
SSDEEP

6144:POZZuCwyBadUBgFE43NgdvMAKJf0G0fOXtMTw34X/:2ZcCwzdUBgh0v8MGbV4

Score

10^/10

isrstealer collection 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 5 IoCs

resource	yara_rule
behavioral1/memory/1060-66-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1060-70-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1060-72-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1060-106-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1060-108-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1988-104-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1988-105-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1988-104-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1988-105-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 5 IoCs

pid	Process
952	winlogon.exe
1060	winlogon.exe
1692	winlogon.exe
1804	csrss.exe
1988	winlogon.exe

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1692-79-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1692-84-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1692-85-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1692-94-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1692-95-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1988-98-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1988-103-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1988-104-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1988-105-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Loads dropped DLL 4 IoCs

pid	Process
1168	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe
1168	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe
952	winlogon.exe
952	winlogon.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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\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-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run\Winlogon = "C:\\Users\\Admin\\AppData\\Roaming\\SubFolder\\SubFolder\\winlogon.exe"	winlogon.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\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 952 set thread context of 1060	952	winlogon.exe	28
PID 1060 set thread context of 1692	1060	winlogon.exe	29
PID 1060 set thread context of 1988	1060	winlogon.exe	33

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe
1804	csrss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1804	csrss.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1060	winlogon.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 952	1168	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	27
PID 1168 wrote to memory of 952	1168	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	27
PID 1168 wrote to memory of 952	1168	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	27
PID 1168 wrote to memory of 952	1168	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	27
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 952 wrote to memory of 1060	952	winlogon.exe	28
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 1060 wrote to memory of 1692	1060	winlogon.exe	29
PID 952 wrote to memory of 1804	952	winlogon.exe	30
PID 952 wrote to memory of 1804	952	winlogon.exe	30
PID 952 wrote to memory of 1804	952	winlogon.exe	30
PID 952 wrote to memory of 1804	952	winlogon.exe	30
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33
PID 1060 wrote to memory of 1988	1060	winlogon.exe	33

C:\Users\Admin\AppData\Local\Temp\75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe
"C:\Users\Admin\AppData\Local\Temp\75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
  "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:952
- - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
    "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1060
  - - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\bswUN50aUj.ini"
      4⤵
      Executes dropped EXE
      PID:1692
  - - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\6O0fT2yGG3.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:1988
- - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\csrss.exe
    "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\csrss.exe" -keyhide -prochide 1060
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1804

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

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\bswUN50aUj.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

Download Submit
\Users\Admin\AppData\Roaming\SubFolder\SubFolder\csrss.exe

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

Download Submit
\Users\Admin\AppData\Roaming\SubFolder\SubFolder\csrss.exe

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

Download Submit
memory/952-92-0x0000000074EA0000-0x000000007544B000-memory.dmp

Filesize
5.7MB

Download
memory/952-77-0x0000000074EA0000-0x000000007544B000-memory.dmp

Filesize
5.7MB

Download
memory/1060-108-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1060-106-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1060-70-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1060-64-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1060-66-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1060-63-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1168-54-0x0000000076401000-0x0000000076403000-memory.dmp

Filesize
8KB

Download
memory/1168-62-0x0000000074EA0000-0x000000007544B000-memory.dmp

Filesize
5.7MB

Download
memory/1168-55-0x0000000074EA0000-0x000000007544B000-memory.dmp

Filesize
5.7MB

Download
memory/1692-84-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1692-85-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1692-94-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1692-95-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1692-79-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1804-107-0x0000000074EA0000-0x000000007544B000-memory.dmp

Filesize
5.7MB

Download
memory/1804-93-0x0000000074EA0000-0x000000007544B000-memory.dmp

Filesize
5.7MB

Download
memory/1988-103-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1988-104-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1988-105-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1988-98-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download