isrstealer | 75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

Analysis

max time kernel
164s
max time network
171s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-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 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 6 IoCs

resource	yara_rule
behavioral2/memory/1688-139-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1688-138-0x0000000000000000-mapping.dmp	family_isrstealer
behavioral2/memory/1688-141-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1688-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1688-152-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1688-165-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3496-163-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3496-164-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/3496-163-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3496-164-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 6 IoCs

pid	Process
2844	winlogon.exe
2644	winlogon.exe
1688	winlogon.exe
4192	winlogon.exe
220	csrss.exe
3496	winlogon.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3496-159-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3496-162-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3496-163-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3496-164-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Checks computer location settings 2 TTPs 2 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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	winlogon.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\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-1-5-21-2386679933-1492765628-3466841596-1000\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 2844 set thread context of 1688	2844	winlogon.exe	84
PID 1688 set thread context of 4192	1688	winlogon.exe	86
PID 1688 set thread context of 3496	1688	winlogon.exe	90

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4868	4192	WerFault.exe	86

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	winlogon.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe
220	csrss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	220	csrss.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1688	winlogon.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 1324 wrote to memory of 2844	1324	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	83
PID 1324 wrote to memory of 2844	1324	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	83
PID 1324 wrote to memory of 2844	1324	75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe	83
PID 2844 wrote to memory of 2644	2844	winlogon.exe	85
PID 2844 wrote to memory of 2644	2844	winlogon.exe	85
PID 2844 wrote to memory of 2644	2844	winlogon.exe	85
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 2844 wrote to memory of 1688	2844	winlogon.exe	84
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 1688 wrote to memory of 4192	1688	winlogon.exe	86
PID 2844 wrote to memory of 220	2844	winlogon.exe	89
PID 2844 wrote to memory of 220	2844	winlogon.exe	89
PID 2844 wrote to memory of 220	2844	winlogon.exe	89
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90
PID 1688 wrote to memory of 3496	1688	winlogon.exe	90

C:\Users\Admin\AppData\Local\Temp\75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe
"C:\Users\Admin\AppData\Local\Temp\75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1324
- C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
  "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2844
- - 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:1688
  - - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\pljvj4v59G.ini"
      4⤵
      Executes dropped EXE
      PID:4192
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4192 -s 80
        5⤵
        Program crash
        
        PID:4868
  - - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\xl6nl9p9Kq.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:3496
- - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
    "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
    3⤵
    - Executes dropped EXE
    PID:2644
- - C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\csrss.exe
    "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\csrss.exe" -keyhide -prochide 1688
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:220

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4192 -ip 4192
1⤵
PID:4932

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

Query Registry

T1012

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

Filesize
268KB

MD5
ba82b7b0ca3cda4d46bccf28099c0ce2

SHA1
c9139cf34974c7cdaa5a9758c8a08e65e39aac26

SHA256
75987c0b75aa7ce52ee89f46b33cf5e102976286baccf92f1a864f11b48cb9ca

SHA512
dabf5885594f07a595296de3a27868bf3ac71ca88ebcd386a4450540a6e558de5bd677b37299a8b3c77b9f21752901de655195aecf581303b3a8d655fe731e57

Download Submit
memory/220-157-0x0000000074860000-0x0000000074E11000-memory.dmp

Filesize
5.7MB

Download
memory/220-166-0x0000000074860000-0x0000000074E11000-memory.dmp

Filesize
5.7MB

Download
memory/1324-136-0x0000000074860000-0x0000000074E11000-memory.dmp

Filesize
5.7MB

Download
memory/1324-132-0x0000000074860000-0x0000000074E11000-memory.dmp

Filesize
5.7MB

Download
memory/1688-152-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1688-139-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1688-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1688-141-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1688-165-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2844-146-0x0000000074860000-0x0000000074E11000-memory.dmp

Filesize
5.7MB

Download
memory/2844-156-0x0000000074860000-0x0000000074E11000-memory.dmp

Filesize
5.7MB

Download
memory/3496-162-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3496-163-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3496-164-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3496-159-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download