isrstealer | 62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda

Analysis

max time kernel
121s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
30/11/2022, 09:47

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General

Target

62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe
Size

1.2MB
MD5

783d1516e6ec36396c48b888dda448a6
SHA1

879c4a9f0e8c74a2b0832f043c25b2dae3441349
SHA256

62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda
SHA512

11b995ad8948afb83ccf06a057198e7fa4a93860f5a6c0a36e4e8107ed22fa7ba873b0889a297d63e910faafefa62888d1010c18d44546b513fcd3e93baec095
SSDEEP

24576:sTLMhjNOIolZmhpb+sVG/+8+/wCVlItc/MBpslMqYMyp0f3:sTLMhjonAesOWwalyc/WClN5

Score

10^/10

isrstealer collection 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 3 IoCs

resource	yara_rule
behavioral2/memory/540-139-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/540-150-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/540-177-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1932-172-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1932-175-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/3660-152-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/3660-160-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/3660-173-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 7 IoCs

resource	yara_rule
behavioral2/memory/3660-152-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/3660-160-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1280-166-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/1932-172-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1280-174-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/3660-173-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1932-175-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 7 IoCs

pid	Process
840	kpYyT.exe
540	cvtres.exe
888	cvtres.exe
3660	cvtres.exe
1964	CHAM.exe
1280	cvtres.exe
1932	cvtres.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1932-171-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1280-166-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1932-172-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1280-174-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1932-175-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1280-165-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1932-164-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1280-157-0x0000000000400000-0x0000000000426000-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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	kpYyT.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
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-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cvtres.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 840 set thread context of 540	840	kpYyT.exe	82
PID 540 set thread context of 888	540	cvtres.exe	83
PID 888 set thread context of 3660	888	cvtres.exe	84
PID 888 set thread context of 1280	888	cvtres.exe	88
PID 888 set thread context of 1932	888	cvtres.exe	86

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 4 IoCs

pid	Process
840	kpYyT.exe
840	kpYyT.exe
1280	cvtres.exe
1280	cvtres.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	840	kpYyT.exe
Token: SeDebugPrivilege	1280	cvtres.exe
Token: 33	1092	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1092	AUDIODG.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
540	cvtres.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 996 wrote to memory of 840	996	62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe	81
PID 996 wrote to memory of 840	996	62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe	81
PID 996 wrote to memory of 840	996	62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe	81
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 840 wrote to memory of 540	840	kpYyT.exe	82
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 540 wrote to memory of 888	540	cvtres.exe	83
PID 888 wrote to memory of 3660	888	cvtres.exe	84
PID 888 wrote to memory of 3660	888	cvtres.exe	84
PID 888 wrote to memory of 3660	888	cvtres.exe	84
PID 888 wrote to memory of 3660	888	cvtres.exe	84
PID 888 wrote to memory of 3660	888	cvtres.exe	84
PID 888 wrote to memory of 1280	888	cvtres.exe	88
PID 888 wrote to memory of 1280	888	cvtres.exe	88
PID 888 wrote to memory of 1280	888	cvtres.exe	88
PID 840 wrote to memory of 1964	840	kpYyT.exe	87
PID 840 wrote to memory of 1964	840	kpYyT.exe	87
PID 840 wrote to memory of 1964	840	kpYyT.exe	87
PID 888 wrote to memory of 1280	888	cvtres.exe	88
PID 888 wrote to memory of 1280	888	cvtres.exe	88
PID 888 wrote to memory of 1932	888	cvtres.exe	86
PID 888 wrote to memory of 1932	888	cvtres.exe	86
PID 888 wrote to memory of 1932	888	cvtres.exe	86
PID 888 wrote to memory of 1932	888	cvtres.exe	86
PID 888 wrote to memory of 1932	888	cvtres.exe	86

C:\Users\Admin\AppData\Local\Temp\62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe
"C:\Users\Admin\AppData\Local\Temp\62ab007660143cfe4f4ed274c7ae2fd8e72fdd595a3e9d72a0d90c33abf19eda.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:996
- C:\Users\Admin\AppData\Local\Temp\kpYyT.exe
  "C:\Users\Admin\AppData\Local\Temp\kpYyT.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:840
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:540
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:888
    - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
        
        "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
        5⤵
        Executes dropped EXE
        
        PID:3660
    - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
        
        "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
        5⤵
        Executes dropped EXE
        Accesses Microsoft Outlook accounts
        
        PID:1932
    - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
        
        "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1280
- - C:\Users\Admin\AppData\Local\Temp\CHAM.exe
    "C:\Users\Admin\AppData\Local\Temp\CHAM.exe"
    3⤵
    - Executes dropped EXE
    PID:1964

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x46c 0x150
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1092

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

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\CHAM.exe

Filesize
255KB

MD5
8f064640da380d34a0485de34d03388c

SHA1
488e5da5a955aaed1848c026ced220b0fbeb1190

SHA256
b158a4635a85827f3d78a9c26c6ad9a0bc3126f4cf6329c2fdd039ed9fa71356

SHA512
34cee8a5741bfe23e6909398c7e12cdfd926de46afcd984ddba32936639686a61320622adc45d0c3be549ed0d6385d2954377a5ae36099998cb176313f438157

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

Filesize
255KB

MD5
8f064640da380d34a0485de34d03388c

SHA1
488e5da5a955aaed1848c026ced220b0fbeb1190

SHA256
b158a4635a85827f3d78a9c26c6ad9a0bc3126f4cf6329c2fdd039ed9fa71356

SHA512
34cee8a5741bfe23e6909398c7e12cdfd926de46afcd984ddba32936639686a61320622adc45d0c3be549ed0d6385d2954377a5ae36099998cb176313f438157

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
C:\Users\Admin\AppData\Local\Temp\data.dmp

Filesize
54B

MD5
c10dbeca73f8835240e08e4511284b83

SHA1
0032f8f941cc07768189ca6ba32b1beede6b6917

SHA256
0b6b62094048f0a069b4582f837afcb941db51340d0b16d578e8cbe8603a071e

SHA512
34f7ab8b4ab7b4996b82ffc49198103ef245ee7dd5ccfec793a9ee391b9e9bb30bd3916b4ebeaa9c66a4b5ca42f8572418f16dc83d41073bc94389c19916b967

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

Filesize
815KB

MD5
ec1b8fe6351a9062ceb503c96c8723e8

SHA1
3817a4d50486e11d5b78ba581a2b0aba7a8f920f

SHA256
2e0158c44dc077998eba747997a1e3df73e50474cfd25b020168faae7e44f5bc

SHA512
0a924731fc016efd72499569297689bf5184b1ccbb18e689ba3f9badc2ef8437463e922787b1c20dcbdeee8b107c1839b90b918cbaa3f456d893425d890156c9

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

Filesize
815KB

MD5
ec1b8fe6351a9062ceb503c96c8723e8

SHA1
3817a4d50486e11d5b78ba581a2b0aba7a8f920f

SHA256
2e0158c44dc077998eba747997a1e3df73e50474cfd25b020168faae7e44f5bc

SHA512
0a924731fc016efd72499569297689bf5184b1ccbb18e689ba3f9badc2ef8437463e922787b1c20dcbdeee8b107c1839b90b918cbaa3f456d893425d890156c9

Download Submit
memory/540-139-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/540-177-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/540-150-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/840-137-0x0000000074FD0000-0x0000000075581000-memory.dmp

Filesize
5.7MB

Download
memory/840-169-0x0000000074FD0000-0x0000000075581000-memory.dmp

Filesize
5.7MB

Download
memory/888-149-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/888-148-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/888-170-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/888-146-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/996-136-0x0000000074FD0000-0x0000000075581000-memory.dmp

Filesize
5.7MB

Download
memory/996-132-0x0000000074FD0000-0x0000000075581000-memory.dmp

Filesize
5.7MB

Download
memory/1280-174-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1280-157-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1280-166-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1280-165-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1932-172-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1932-175-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1932-164-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1932-171-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3660-173-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3660-160-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3660-152-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download