isrstealer | 1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af

General

Target

1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe
Size

592KB
MD5

0016b20e46142e2b1b314f7a5459da56
SHA1

b42c13859d16033610266d955dc041ccc745b0fc
SHA256

1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af
SHA512

66776fb74aea1174ee7f2fc446d6b7fcffc18cb580d10527832011217343f51f7cd19d1039b0b39d34fa18fc3e5addbfe22706fc94a85867b78bf31011aa7822
SSDEEP

12288:6F7dFeCXuLKcCVsz6SDLXo67gwv3/jA0:gPeCXuLKdsO4L4gs

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 4 IoCs

resource	yara_rule
behavioral2/files/0x0006000000022e6c-138.dat	family_isrstealer
behavioral2/files/0x0006000000022e6c-139.dat	family_isrstealer
behavioral2/files/0x0006000000022e6c-144.dat	family_isrstealer
behavioral2/files/0x0006000000022e6c-152.dat	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4248-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4248-156-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/4248-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4248-156-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 4 IoCs

pid	Process
1944	tmpB76E.tmp.exe
1004	tmpB9DF.tmp.exe
5036	tmpB9DF.tmp.exe
4248	tmpB9DF.tmp.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5036-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5036-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5036-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5036-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4248-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4248-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4248-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4248-156-0x0000000000400000-0x000000000041F000-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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	tmpB76E.tmp.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-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	tmpB9DF.tmp.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1004 set thread context of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 set thread context of 4248	1004	tmpB9DF.tmp.exe	87

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 AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4844	1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe
Token: SeDebugPrivilege	1944	tmpB76E.tmp.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1004	tmpB9DF.tmp.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4844 wrote to memory of 1944	4844	1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe	84
PID 4844 wrote to memory of 1944	4844	1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe	84
PID 1944 wrote to memory of 1004	1944	tmpB76E.tmp.exe	85
PID 1944 wrote to memory of 1004	1944	tmpB76E.tmp.exe	85
PID 1944 wrote to memory of 1004	1944	tmpB76E.tmp.exe	85
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 5036	1004	tmpB9DF.tmp.exe	86
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87
PID 1004 wrote to memory of 4248	1004	tmpB9DF.tmp.exe	87

C:\Users\Admin\AppData\Local\Temp\1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe
"C:\Users\Admin\AppData\Local\Temp\1603bf16a86935417f4a52c5fee3f5bd30fefcbaed1c7483ebd32c80f7fef8af.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4844
- C:\Users\Admin\AppData\Local\Temp\tmpB76E.tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmpB76E.tmp.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1944
- - C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1004
  - - C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\qrwhAPyr7V.ini"
      4⤵
      Executes dropped EXE
      PID:5036
  - - C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\d2QKYYGq7j.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:4248

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\qrwhAPyr7V.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB76E.tmp.exe

Filesize
476KB

MD5
166f4c2b89b53baa3c5e4475e10f2864

SHA1
4a6ee1203a7438829aa827b2dd2b65385faf0c5d

SHA256
db75620a7a381f7130486d40a906750f3a1a64ea8464f205258e800c0bf95222

SHA512
9e4a21621fc18c628419ee9d3bd622bf7309af3a3fb77a92de2dcb48e6f75cc403977be18035f52c53a717d83c24b4c8688c1baefc91cf0a1c2c2b09a796c190

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB76E.tmp.exe

Filesize
476KB

MD5
166f4c2b89b53baa3c5e4475e10f2864

SHA1
4a6ee1203a7438829aa827b2dd2b65385faf0c5d

SHA256
db75620a7a381f7130486d40a906750f3a1a64ea8464f205258e800c0bf95222

SHA512
9e4a21621fc18c628419ee9d3bd622bf7309af3a3fb77a92de2dcb48e6f75cc403977be18035f52c53a717d83c24b4c8688c1baefc91cf0a1c2c2b09a796c190

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe

Filesize
356KB

MD5
8fb18ab6b51da8db364ca170809ca78f

SHA1
ac65556471c38f7b5be5d53b312421651560ab2e

SHA256
01891d868656424269aeb63f7d7659037ee7941755ac78b5498cccbe2d3d3ba2

SHA512
179b338e2798c78beb4947648f68051c89b471a745386637ddcdf60e5edec269045959a954f8df3c3c2d14feb5e4e4885edace79f200e01c042d34d5fd18d205

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe

Filesize
356KB

MD5
8fb18ab6b51da8db364ca170809ca78f

SHA1
ac65556471c38f7b5be5d53b312421651560ab2e

SHA256
01891d868656424269aeb63f7d7659037ee7941755ac78b5498cccbe2d3d3ba2

SHA512
179b338e2798c78beb4947648f68051c89b471a745386637ddcdf60e5edec269045959a954f8df3c3c2d14feb5e4e4885edace79f200e01c042d34d5fd18d205

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe

Filesize
356KB

MD5
8fb18ab6b51da8db364ca170809ca78f

SHA1
ac65556471c38f7b5be5d53b312421651560ab2e

SHA256
01891d868656424269aeb63f7d7659037ee7941755ac78b5498cccbe2d3d3ba2

SHA512
179b338e2798c78beb4947648f68051c89b471a745386637ddcdf60e5edec269045959a954f8df3c3c2d14feb5e4e4885edace79f200e01c042d34d5fd18d205

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB9DF.tmp.exe

Filesize
356KB

MD5
8fb18ab6b51da8db364ca170809ca78f

SHA1
ac65556471c38f7b5be5d53b312421651560ab2e

SHA256
01891d868656424269aeb63f7d7659037ee7941755ac78b5498cccbe2d3d3ba2

SHA512
179b338e2798c78beb4947648f68051c89b471a745386637ddcdf60e5edec269045959a954f8df3c3c2d14feb5e4e4885edace79f200e01c042d34d5fd18d205

Download Submit
memory/1944-136-0x00007FFAA0BA0000-0x00007FFAA15D6000-memory.dmp

Filesize
10.2MB

Download
memory/4248-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4248-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4248-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4248-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4844-132-0x00007FFAA0BA0000-0x00007FFAA15D6000-memory.dmp

Filesize
10.2MB

Download
memory/5036-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5036-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5036-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5036-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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